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.

1

Hell’s Kitchen

Image: Michael Matloka

What’s in a name? In this case, fire, grit, and a wink of humor. Legend has it that during a riot, a young police officer muttered, "This place is hell itself," only for his older partner to quip, "Hell’s a mild climate—this is hell’s kitchen." The pun was too good to forget, and the nickname stuck. Years later, developers tried a new label—"Clinton"—hoping it would sound more welcoming on real estate brochures. But New Yorkers can be a bit stubborn, and locals chose to keep the old name. After all, only "Hell’s Kitchen" could do justice to a neighborhood with that much flavor, grit, and, well, heat.

2

Harlem

Image: Phil Evenden

Back in the 1600s, when northern Manhattan was little more than farmland, Dutch settlers, homesick for their town across the sea, named the area Nieuw Haarlem after Haarlem in the Netherlands. Time smoothed away the "Nieuw," but the name remained. Centuries later, Harlem became something entirely of its own: a world capital of music, art, and pride. The rhythms may have changed from Dutch hymns to jazz and soul, but the name still carries the same echo of nostalgia and creativity.

3

Greenwich Village

Image: Budgeron Bach

Long before jazz bars and coffeehouses filled the air with chatter, this corner of Manhattan was a quiet patch of countryside known as Groenwijck—Dutch for "pine district." The British, with their habit for renaming, turned it into Greenwich, and generations of locals affectionately shortened it to "the Village." Its winding lanes still ignore the city’s rigid grid, twisting and bending like memories of the farmland that came before. Even today, as musicians play on stoops and artists linger in cafés, the Village keeps that timeless feeling.

4

Chelsea

Image: Elric Pxl

Here’s a name steeped in nostalgia and old-world charm. In the mid-1700s, retired British Major Thomas Clarke bought a large plot of land overlooking the Hudson River and built his dream home, naming it "Chelsea" after the genteel London district he once knew. The estate is long gone, swallowed by the city’s constant growth, but its name never left the map. Over the centuries, the neighborhood evolved with a flair worthy of its heritage. First a quiet residential area, then a bustling creative hub filled with galleries, theaters, and fashion studios. Much like its London namesake, New York’s Chelsea has always worn its artistic spirit proudly, with just the right touch of elegance.

5

The Meatpacking District

Image: TanjaSchwarz

It sounds tough because it was. In the early 1900s, this corner of Manhattan had more than 250 meatpacking plants and slaughterhouses filling the air with noise—and, yes, a certain aroma that no candle could ever mask. Workers hauled sides of beef down cobblestone streets dusted with ice and sawdust, a daily ballet of grit and muscle. Today, the scent of raw steak has been replaced by perfume and espresso, and the warehouses now house boutiques and rooftop bars. Still, the name "Meatpacking District" hangs on proudly, a reminder that even glamour was built on hard work and heavy lifting.

6

Times Square

Image: James Ting

Believe it or not, the origin of this glowing crossroads has more to do with ink and paper than neon lights. In 1904, when The New York Times moved its headquarters to what was then called Longacre Square, the city decided to rename the area in the paper’s honor. To mark the occasion, the Times threw a grand celebration complete with fireworks and electric lights. Decades later, the newspaper has long since moved out, but the glow never dimmed. What began as a nod to journalism became the city’s biggest stage, where the lights still flash like headlines that never stop breaking.

7

SoHo

Image: Zeke Goodyear

It may sound like a borrowed bit of London, but this SoHo is a New York creation. Back in the 1960s, urban planner Chester Rapkin was writing a report about a fading industrial zone just SOuth of HOuston Street, and casually shortened that phrase into "SoHo." He couldn’t have known he was naming one of the city’s trendiest neighborhoods. As artists began filling the old cast-iron factories with studios and galleries, the nickname spread faster than wet paint. Soon, SoHo meant loft living, street art, and downtown cool. And here’s a fun fact for visitors: in Manhattan, Houston is pronounced HOW -ston, not like the Texas city. Mispronounce it, and you’ll hear all about it before you hit the next crosswalk!

8

NoHo

Image: Dylan Dehnert

By now, you probably know the drill. After the renaming of SoHo proved such a success, the north couldn’t be left behind. When the area NOrth of HOuston Street, another cluster of lofts and studios began to bloom, it soon earned the mirrored name "NoHo." Smaller and quieter, it kept its creative streak without the chaos. Cast-iron buildings, cobbled streets, and a calm charm that feels like SoHo’s thoughtful twin, equally artistic but happy to hum instead of shout.

9

TriBeCa

Image: Essow K

What if geometry had a ZIP code? That’s pretty much how TRIangle BElow CAnal Street —better known as TriBeCa—came to be. The name began as a bit of city-planning jargon for a small, oddly shaped area, but once The New York Times printed it, the label spread faster than a rumor on the subway. Before long, the whole neighborhood embraced its new identity. Today, those wide streets and grand old warehouses host film festivals, art galleries, and lofts so sleek they make geometry look downright glamorous.

10

NoLIta

Image: Alex Haney

Tucked just NOrth of LITtle ITAly, this petite pocket of Manhattan once blended seamlessly with its pasta-and-pastry-filled neighbor. Then came the wave of stylish boutiques, corner cafés, and street-front charm that begged for its own identity. The solution? NoLIta, a name so snappy it sounds like it’s been around forever. Sleek, sunny, and effortlessly cool, it’s proof that in New York, a clever name can turn a few city blocks into a full-blown destination.

11

Turtle Bay

Image: Masahiro Naruse

At first glance, the name sounds cute enough for a storybook, and in a way, it is. Back in the 1600s, Dutch settlers named a small farm near a creek that flowed into the East River. Some say it referred to the turtles that lived there; others claim it came from the Dutch word deutal , "bent blade," describing the curve of the bay. Either way, it’s one of Manhattan’s softest names, a calm corner in the city that never sleeps.

12

Gramercy

Image: Megan Bucknall

Long ago, this Manhattan neighborhood was a swampy patch of land the Dutch called Krom Moerasje , meaning "little crooked marsh," hardly the kind of description you’d want on a real estate brochure. In the early 19th century, developer Samuel B. Ruggles acquired the land and renamed it Gramercy , adapting an archaic expression derived from the French grand merci , meaning "many thanks." Suddenly, it sounded far more elegant. The neighborhood grew around its most famous feature: Gramercy Park, a private, gated square that remains key-only to this day. In New York, that’s about as close as it gets to a secret garden.

1

Gold Rush myths bubbled up immediately

Image: Tomáš Malík

It didn’t take long for the truth to get buried. As soon as gold was discovered, the stories started to shimmer. Tales of instant wealth, golden boulders, and rivers gleaming with nuggets.

Letters home were often exaggerated, and newspapers sensationalized every find. These myths fueled the frenzy and caused proverbial FOMO all over the world. People wanted to see it for themselves.

2

The best Western business wasn’t in fact gold

Image: Stefan Münz

If you wanted to get rich during the gold rush, you had better chances opening a store than mining. That was the golden rule for smart entrepreneurs like Levi Strauss, who didn’t strike it rich in a streambed, but in a sewing room. Another legend, Samuel Brannan, made a fortune selling picks, pans, and shovels —not gold.

3

The "49ers" were actually latecomers

Image: Emilie

The famed "49ers," the nickname for those swept up in the gold frenzy in 1849, weren’t the first on the scene. There’s a plot twist. Gold was discovered in January 1848 at Sutter’s Mill.

But the news spread slowly . By the time the world caught on, most of the easily accessible gold had already been plucked from riverbeds by locals, soldiers, and early arrivals.

4

Thousands came from China and South America

Image: rc.xyz NFT gallery

The Gold Rush was a global stampede . Tens of thousands of Chinese immigrants crossed the Pacific, some bringing generations of mining knowledge with them. Others came from Chile, Peru, and Mexico, arriving in San Francisco to find opportunity.

5

Women were there not just as camp followers

Image: Michael & Diane Weidner

Women were there too, not just as wives, but as businesswomen, cooks, hoteliers, and even miners. Take Luzena Wilson, a widow who hauled her children west and set up a boarding house for miners. Her clean beds and hot meals turned into a booming business.

Others ran laundries, tended bar, or staked their own claims. In a lawless land where survival meant creativity, many women found fortune in hard work.

6

Some came from Hawaii, Russia, and Europe

Image: Trey Hollins

They called them " Argonauts ," a romantic nod to the Greek myth of Jason and his quest for the Golden Fleece. And like the legend, the real Gold Rush was international. Adventurers came not just from the American East, but from as far as Russia’s Pacific coast, the Hawaiian Islands, and every corner of Europe.

7

Gold Rush towns became ghost towns

Image: Stefan Münz

Take Bodie, for example. A lawless hotspot where saloons outnumbered schools. At its peak, it had over 10,000 residents. A few decades later, it was all tumbleweeds and creaky wood .

Once the gold ran out, so did the people. Tools were abandoned and whole towns vanished almost overnight, leaving behind eerie remnants.

8

The "Gold Fever" spread worldwide

Image: suradeach saetang

Once word of gold reached distant shores, "gold fever" spread around the world . Australia had its own rush by 1851. The Klondike in Canada followed in the 1890s, and South Africa’s rich deposits turned Johannesburg into a boomtown in the 1880s.

Prospectors chased hope, not just gold. Each new report of found gold sparked a fresh migration, with fortune-seekers packing up and heading to the hot spots.

9

Gold mining required team effort

Image: Elena Mozhvilo

Forget the image of the lone prospector whistling by the river . That only worked for a short time.

As surface gold dried up, miners turned to hard labor, which involved blasting rock, diverting rivers, and eventually using powerful water cannons in a process called hydraulic mining. It was expensive. Teams of men pooled resources, hired help, and invested in equipment.

10

Many "Gold Seekers" never even made it to California

Image: James Lee

Getting to California in the 1840s was no stroll through the prairie. Hundreds of the hopefuls who set out never arrived. Some perished on the overland trails due to disease, accidents, or exhaustion.

The sea route around Cape Horn was no solution; it was just longer and colder. Some turned back. Others settled in Oregon or Utah. A few found fortune far from the gold fields.

11

The "Gold Rush" fueled California's statehood

Image: Emre Ayata

In 1848, California was a sleepy outpost with little U.S. oversight. By 1850, it had boomed into a booming, brawling land with more than enough people.

The rush had brought merchants, farmers, lawyers, and politicians. With them came the push for schools, railroads, and laws. California skipped the usual phase of being a U.S. territory and leapfrogged straight into statehood.

12

Women and children wrote some of the best eyewitness accounts

Image: The Cleveland Museum of Art

Some of the most vivid details of this era came from women and children who chronicled the chaos . Their letters and diaries tell of lonely cabins, muddy streets, makeshift schools, and the daily drama of camp life.

Women like Louise Clappe (aka "Dame Shirley") wrote witty, unfiltered dispatches from the Sierra Nevada. Young girls described the thrill of arriving in San Francisco and the terror of crossing the plains.

13

The Gold Rush didn't end in 1850

Image: Michael & Diane Weidner

By the time most folks arrived, the easy pickings were gone, and the story was just getting started.

The gold fever didn’t vanish in a year. Prospecting surged well into the 1850s and beyond. Some of the biggest strikes, like Nevada’s Comstock Lode in 1859, came after the main rush was supposedly over. By then, mining had evolved into an industrial enterprise, with machinery, corporations, and deeper digs.