1

Dundas Castle, Roscoe, New York

Image: Annie Spratt

Also known as Craig-e-Clair, this castle was built by Ralph Dundas in the early 20th century. It is an architectural marvel of stone and copper.

Dundas died before the castle was completed, and his wife was reportedly committed to a sanitarium shortly after. Consequently, no member of the Dundas family ever actually lived in the mansion. This has led to the "Ghost of Dundas Castle" legends, with locals claiming to see a woman in white wandering the unfinished halls, waiting for a housewarming party that never happened.

2

Rockwell House, Milledgeville, Georgia

Image: Clem Geiss

Built in 1838, the Rockwell House is a stunning example of Federal-style architecture, but its beauty is shadowed by a dark past. It was originally built for Colonel Samuel Rockwell, a prominent lawyer.

Local lore whispers about the "Rockwell Ghost," believed to be a young girl who died during a yellow fever outbreak. However, the house’s most tangible secret lies in its survival; it has endured multiple fires and periods of extreme neglect. In recent years, it has become a focal point for preservationists who uncovered hidden structural reinforcements that suggest the house was built to be an impenetrable fortress of its era.

3

Elda Castle, Ossining, New York

Image: Nitrogel

If the name David Abercrombie sounds familiar, it’s because he co-founded the clothing company Abercrombie & Fitch . But in the 1920s, he also built this granite castle, named Elda (an acronym of his children’s names), as a secluded retreat.

The castle features a network of spiral staircases and open-air porches designed to blend the indoors with the rugged wild. Its abandonment, however, is a sheer tragedy. After the family moved out, the castle was used as a research facility and later fell victim to vandals. Legend has it that a fire in the 1940s was started by squatters, leaving behind a charred stone husk that resembles a medieval ruin more than a 20th-century home.

4

Mongo's Castle, Memphis, Tennessee

Image: Denny Müller

A stark contrast to the classical mansions of the South, Mongo’s Castle was the passion project of Mongo Bebe, a man who built his home out of scrap stone, Ashlar blocks, and found materials.

The house is a maze of folk-art eccentricity. The builder intended it to be a community center and a symbol of African-American heritage and self-reliance. It stands today as a decaying puzzle, with many neighbors still unsure of the structural logic behind its towering, uneven walls.

5

Bannerman's Castle, Pollepel Island, New York

Image: Leonard G., Public domain, via Wikimedia Commons

Rising from the Hudson River, this castle was never intended to be a home; it was a giant advertisement and warehouse for Francis Bannerman VI’s military surplus empire.

In 1920, 200 tons of gunpowder and shells exploded in the castle’s powder house, blowing out a significant portion of the walls. The ground is still considered unstable due to the remnants of military munitions, and the inscriptions on the walls are actually warnings and advertisements for the Bannerman business. Do you dare visit this mansion?

6

Castle Mont Rouge, Rougemont, North Carolina

Image: Florian Delée

This whimsical, onion-domed castle looks like it belongs in the Russian countryside rather than the North Carolina woods. It was designed by sculptor Robert Mihaly, but he ended up abandoning the project in the early 2000s following a personal tragedy and financial hurdles.

The castle remains an "empty sculpture," filled with intricate marble work and unfinished turrets. The bizarre architectural fusion lacks a standard floor plan, making it nearly impossible to convert into a functional residence without destroying its artistic integrity.

7

Ha Ha Tonka Castle, Camdenton, Missouri

Image: Hannah McBride

Robert Snyder, a wealthy Kansas City businessman, began building this European-style castle in 1905. He wanted a retreat that overlooked the breathtaking Ha Ha Tonka Spring.

Yet, Snyder never got to see his dream finished; he was killed in one of Missouri’s first recorded automobile accidents just a year after construction began. His sons finished the castle, but it was gutted by a fire in 1942. There’s a hidden network of caves beneath the castle, which were rumored to be used by outlaws and later as a natural "refrigerator" for the estate’s kitchen.

8

Carleton Island Villa, Cape Vincent, New York

Image: Tama66

This once-magnificent villa was built for William Wyckoff, who made a fortune with the Remington Typewriter Company.

The Secret: Wyckoff’s dream turned into a nightmare on the very first night he stayed in the house. He suffered a massive heart attack and died in his sleep. His wife had passed away a month prior, leaving the villa to a son who had no interest in it. The house has stood empty for over 70 years, its secret being the tragic "cursed" timing that prevented it from ever functioning as a family home.

9

Dicksonia Plantation, Lowndesboro, Alabama

Image: Theo Bickel

Dicksonia was a quintessential antebellum mansion, featuring the massive columns and wrap-around porches synonymous with the Old South.

Unlike many plantations that were destroyed during the Civil War, Dicksonia survived the conflict only to be destroyed by a mysterious fire in 1939. Its "ghost pillars," however, remained standing long after the wooden house burned away. These towering brick columns became a haunting landmark , representing the structural skeletons of a forgotten social order.

10

Wyndcliffe, Rhinebeck, New York

Image: Peter Herrmann

This house is the literal origin of the phrase "Keeping up with the Joneses." Though often referred to as a "Mystery Mansion" by urban explorers, this is the ruin of Wyndcliffe, the estate of Elizabeth Schermerhorn Jones.

Elizabeth’s mansion was so grand and intimidating that it prompted her neighbors—including the Astors—to build even larger homes to compete. The secret of Wyndcliffe is the psychological impact of its architecture; it was built to inspire envy, and its current state of absolute decay is a poetic commentary on the fleeting nature of social status.

1

He was of French descent

While we think of Paul Revere as an early American icon, his roots lay across the Atlantic. His father, Apollos Rivoire, was a French Huguenot (a member of the French Reformed Church) who fled religious persecution and immigrated to Boston as a teenager.

To fit in his new home, Apollos Americanized the family name to "Revere". Paul was born in late 1734 or early 1735, the son of Apollos and a Boston local called Deborah Hichborn. Apollos was so interested in blending in that he never taught his children to speak and read French. In fact, a young Paul Revere even fought against the French as part of the colonial forces during the French and Indian War.

2

He was an accomplished artisan

Before he was a revolutionary, Revere was a master craftsman. He learned the art of silversmithing from his father and quickly gained a reputation as an accomplished artisan. He designed seals, coats of arms, plate engravings, and silver teapots.

Revere also used his engraving skills to create sharp political cartoons that mocked the British. His most famous artistic work was a sensationalized engraving of the 1770 Boston Massacre. It wasn’t entirely historically accurate, but it spread through the colonies, stirring up the anti-British sentiment that laid the groundwork for the Revolution.

3

He worked as an amateur dentist

When silversmithing work ran slow, Revere picked up a side hustle: dentistry. He started cleaning teeth and crafting dental prosthetics out of animal teeth and walrus ivory for the people of Boston.

This amateur dental career actually led to a major moment in American history. In 1775, Revere’s close friend, Dr. Joseph Warren, was killed at the Battle of Bunker Hill and buried in an unmarked mass grave by British soldiers. A year later, when the bodies were exhumed, the remains were unrecognizable. Yet, Revere was able to identify Warren’s body by recognizing the specific ivory tooth and custom wire bridge he had personally crafted for his friend. It’s widely considered one of the earliest documented cases of forensic dentistry in the United States.

4

He played a key role in early intelligence efforts

Long before the CIA existed, Paul Revere was working as a pioneer of organized American espionage. As a member of the Sons of Liberty, Revere wanted to track British movements closely. In 1774, he helped form a spy group known as "the mechanics" or the "Liberty Boys".

These men were Bostonian blacksmiths, artisans, and laborers who used their ordinary routines to watch British troops, listening for rumors of upcoming military actions. The spies would gather at the city’s historic Green Dragon Tavern to trade secrets and map out British movements.

5

Longfellow's inaccurate poem

If your knowledge of Revere comes from Henry Wadsworth Longfellow’s famous 1861 poem, "Paul Revere's Ride," you’ve been given a romanticized version of history. Longfellow wrote the poem nearly a century later, on the brink of the American Civil War, to stir up national pride.

In reality, Revere wasn’t a lone rider. The night of April 18, 1775, Revere set out with two other main horsemen: William Dawes and Dr. Samuel Prescott. As they triggered local alarms, dozens of other riders joined the effort. By midnight, more than 40 people were racing across the country, spreading the word. Furthermore, Revere never actually made it to his final destination of Concord. He was captured and briefly detained by a British patrol.

6

He didn’t even own a horse for his midnight ride

It’s hard to imagine the midnight ride without Revere’s faithful steed, but the truth is, Revere didn’t even own a horse when the fateful night arrived. Because he had to be quietly rowed across the Charles River, bringing a horse from Boston was out of the question.

Once he reached Charlestown, he had to find a ride. He ended up borrowing a horse from a sympathetic local merchant called John Larkin. Legend has it that this borrowed mare was named "Brown Beauty". Sadly, after Revere was captured later that night, the soldiers confiscated the horse, and she was never seen again.

7

He didn’t actually say THAT

"The British are coming!" is one of the most famous quotes in American history, but Revere never said it. The countryside was crawling with British soldiers, so his mission had to be very quiet. Yelling at the top of his lungs would have landed him in military prison before he even left town. Instead, he went door to door delivering the warning quietly to specific patriots.

Also, the phrase wouldn’t have made sense to the colonists. At the moment in 1775, the colonists still considered themselves British citizens. Instead, historical accounts indicate that Revere used the phrase, "The Regulars are coming out!" "Regulars" was the standard colonial term for the standing British army troops.

8

His military record wasn't outstanding

Although Revere was a phenomenal community organizer and courier, his transition into traditional military leadership didn’t go smoothly. During the war, he served as a major and later a lieutenant colonel in the Massachusetts State Artillery. His military career hit a disastrous low point in the summer of 1779 during the Penobscot Expedition in modern-day Maine.

The mission was a total failure for the Americans. In the aftermath, Revere was accused of cowardice, laziness, and disobedience. He faced a court-martial and spent several years fighting to clear his name. He was ultimately acquitted of all charges in 1782, but the incident permanently tarnished his dreams of military glory.

9

Fatherhood came early… and often

If you think managing a household today is stressful, consider Paul Revere’s domestic life: he fathered an astonishing 16 children.

He had his first eight children with his first wife, Sarah Orne. Following her death in 1773, he remarried a woman called Rachel Walker, with whom he had another eight children. They crammed this huge family into a small townhouse at 19 North Square in downtown Boston. Amazingly for the 18th century, 11 of his 16 children survived to adulthood.

10

Revere Copper Products, Inc. is still in operation

After the Revolution ended, Revere left politics and went back to industry with some success. He opened a hardware store, a foundry, and the first rolling copper mill in the United States.

In fact, his business supplied the copper used to protect the hull of the USS Constitution. He also cast nearly 1,000 church bells, many of which still ring across New England today. Amazingly, the company he founded, Revere Copper Products, Inc., is still in business. Paul Revere passed away in 1818 at the age of 83, leaving behind a legacy more industrious than a single night’s ride.

1

Raven Rock Mountain Complex

Image: Ilagam

Did you know that in the 1950s, the US government carved out a secret underground city that could survive a nuclear attack? It’s called an "underground Pentagon", and very much like Area 51, it is one of the government's most classified projects.

This military complex and nuclear bunker is located near Blue Ridge Summit, Pennsylvania, 768 feet below the ground. It’s protected by 23.5 ft thick 30-ton doors built on top of springs to survive the shock from a blast. Raven Rock has five buildings with 15 floors big enough to live and work. The base has everything it needs to keep running, like a cafeteria, a barbershop, water generators, and even a medical center.

2

SubTropolis

Image: mwewering

Below Kansas City, Missouri, lies the world's largest underground business complex. SubTropolis is a structure located inside a mine north of the Missouri River. It was carved out of limestone some 135 to 185 feet underground and covers a total of 55 million square feet.

Kansas City Chiefs founder Lamar Hunt built this subterranean city in the 1960s. It has offices, storage space, and even factories. Over 1,600 people work here every day, largely because SubTropolis remains cool all year, making it an ideal location for businesses. Fun fact: some of Hollywood’s most beloved masterpieces are kept here, including the original film reels of Gone with the Wind and The Wizard of Oz.

3

Underground Atlanta

Image: Ronny Sison

Underground Atlanta is a historic spot in downtown Atlanta, Georgia. It was built in the late 1800s, right after the Civil War, as a commercial district centered around the railroad. In the 1920s, viaducts were built and the streets were raised, creating a second level of streets, buildings, and shops.

During Prohibition, the abandoned underground space served as the best spot for speakeasies and juke joints. For decades, people forgot about the hidden city, but in the 1960s, it was brought back to life as a fun place for music bars and nightlife.

4

New York City Subterranean World

Image: Photographer: unknown, Public domain, via Wikimedia Commons

Under America’s most populous city, there's a whole hidden world. For example, beneath Little Italy and the Public Library, there are secret vaults. Beyond the subway millions of people use daily, there is City Hall station, opened in 1904 and closed in 1945. It's a hidden gem with stained glass and mosaics that you can still visit by staying on the 6 train past the last stop.

But that’s not all! There are trading tunnels in SoHo and old cattle tunnels in the Meatpacking District. Also, in 1897, there were mail tubes built around the city to send letters between post offices that operated until the 1950s. Some of these underground spaces go as deep as 800 feet!

5

Permafrost Tunnel Research Facility

Image: Paxson Woelber

A large part of the land in the northern hemisphere is Permafrost, so it makes sense that there is a research facility specially built to study it. The Permafrost Tunnel in Alaska is the best place to learn about frozen soil that's over 40,000 years old.

The long tunnel was dug from 1963 to 1969 to study how to build and mine in frozen environments. Inside the facility, scientists study ice, ancient plants, and even bones from animals like mammoths. The tunnel shows different layers of earth, uncovering frozen ground from different time periods that help scientists anticipate what might happen as the world gets warmer.

6

The Greenbrier Bunker

Image: Alex Holzreiter

The Greenbrier Bunker in White Sulphur Springs, West Virginia, is a secret underground facility beneath a luxury hotel that has hosted numerous US presidents and famous guests. It was built during the Cold War to protect the US Congress in the event of a nuclear attack. The bunker was designed to house all 535 members of Congress and their staff for a long time.

This classified underground facility remained a secret until 1992, when a Washington Post article exposed it. Today, visitors can take tours to see special rooms, blast doors, and decontamination areas.

7

The Caverns

Image: jymy duhomme

Would you attend a concert underground? If you travel to Tennessee is totally possible! The Caverns, formerly known as Bluegrass Underground, is a very cool spot in Grundy County, Tennessee. Lying deep in a cave 333 feet underground, this concert venue with natural acoustics is the perfect place for live music.

People come from all over to hear a variety of performances, especially Bluegrass music. The Caverns can accommodate up to 1,200 people standing up and are equipped with state-of-the-art sound and lights. The cave's cool and quiet atmosphere makes the experience extra special!

8

Crystal City Underground

Image: Gustavo Alejandro Espinosa Reyes

Beneath the neighborhood of Crystal City, near Washington, DC, lies a network of shops, restaurants, and offices. It opened in 1976 and was designed to feel like an old shopping village with cobblestone streets and antique glass windows.

The underground space covers 150,000 square feet and connects several buildings. It's a popular spot for office workers and visitors, especially when the weather is bad. Unfortunately, in 2024, the shops closed, ending their retail era. Yet, the underground walkways and connections to the Metro remain open for pedestrians.

9

Los Angeles Prohibition Tunnels

Image: Alpha Perspective

In the 1920s, during Prohibition, people had to find ingenious ways around the restrictions on selling and consuming alcohol. That's why they built about 11 miles of underground tunnels right under Los Angeles.

Many of these subterranean sites are now closed, but you can still find a few hidden entrances around the city. You can even go on a tour to explore the tunnels and learn about their secret history.

10

Havre Beneath the Streets

Image: Đào Việt Hoàng

After a big fire in 1904 destroyed Havre’s business district in Montana, many shops moved underground. They used the old steam tunnels to stay safe from fires and bad weather. For years, the tunnels were busy with people and stores, such as saloons, drugstores, laundromats, and even a brothel. But today it is completely silent.

Fortunately, you can still visit what is left of this hidden city to see old shops and learn how people stayed safe and worked over 100 years ago. It's like going back in time!

11

Cheyenne Mountain Complex

Image: See page for author, Public domain, via Wikimedia Commons

One of the safest places in the world is right here in America, more specifically in El Paso County, Colorado. Hidden inside a mountain, Cheyenne Mountain Complex was built in the 1960s to protect the US military from nuclear attacks.

The bunker stands under 2,000 feet of solid Granite, making it super strong and safe. It was once the command center for NORAD (North American Aerospace Defense Command). The complex has blast doors that weigh 25 tons each and can withstand a nuclear blast. It also has its own power, water, and food supply. People could survive there for months!

12

Forestiere Underground Gardens

Image: Levi Clancy, CC0, via Wikimedia Commons

A Sicilian immigrant called Baldassare Forestiere spent 40 years digging and building a series of subterranean structures by hand in Fresno, California. Inspired by Roman catacombs and old wine cellars, he created around 65 rooms, tunnels, and courtyards to escape the hot summer sun.

The Gardens have fruit trees, grapevines, fishponds, and even a chapel. Some of the trees are more than 90 years old! Today, Forestiere Underground Gardens is a Historical Landmark you can visit if you want to discover a true underground paradise.