1

Abraham Lincoln and John F. Kennedy

Abraham Lincoln led the country through the Civil War in the 1860s, while John F. Kennedy governed during the Cold War and the civil rights movement of the 1960s. Both led the U.S. during make-or-break moments, and both were tragically assassinated while in office.

The major coincidence is the exact 100-year parallel in their timelines . Lincoln was elected to Congress in 1846, became president in 1861, and was killed at Ford's Theatre in Washington, D.C., on the night of April 14, 1865. Kennedy was elected to Congress in 1946, became president in 1961, and was shot while riding in the presidential motorcade in Dallas, Texas, in 1963. There is more: both men were shot on a Friday while sitting next to their wives. Lincoln was 56, while Kennedy was 46.

2

Jefferson and Adams

Thomas Jefferson was born in Virginia in 1743 and was eight years younger than John Adams, who was born in Massachusetts in 1735. While Adams was a Federalist, Jefferson helped lead the Democratic-Republicans, and the bitter election of 1800 pushed them apart for years. Then, in 1812, Adams wrote to Jefferson, opening the door to a long exchange of letters that slowly repaired their friendship.

The tragic yet mysterious event came on July 4, 1826, exactly 50 years after the Declaration of Independence. Jefferson died in Virginia at age 83 of intestinal and kidney issues, and Adams died a few hours later in Massachusetts at age 90 due to heart failure. According to reports, Adams’s last words were "Thomas Jefferson survives," not knowing Jefferson had already died .

3

Monroe

James Monroe has more in common with Jefferson and Adams than you might think. He became the fifth president of the United States and is best remembered for the Monroe Doctrine, a major statement in American foreign policy.

Five years after Jefferson and Adams passed away, Monroe, 73, died on the same date in 1831, the 4th of July. This incident made him the third U.S. president to die on Independence Day.

4

Mark Twain

Mark Twain is one of America’s greatest authors, famous for such classics as The Adventures of Tom Sawyer and The Adventures of Huckleberry Finn .

The unusual coincidence is the timing of his life and death. Twain was born in 1835, the exact year Halley’s Comet passed by Earth. In 1909, he publicly joked that he came in with the comet and expected to die when it returned. In fact, his prediction came true: the comet returned to view in April 1910, and Twain died at age 74 of a heart attack the very next day.

5

Martin Luther King Jr. and Anne Frank

Martin Luther King Jr. was the activist who led the American civil rights movement. Anne Frank was a young German Jewish girl whose hidden diary, discovered after her death, made her one of the most iconic figures of the Holocaust.

Because we remember Anne Frank as a teenager and Martin Luther King Jr. as an adult leader, it feels like they belong to two different eras. But the truth is, both were born in 1929, just a few months apart. Martin Luther King Jr. in January and Anne Frank in June.

6

Johnson and Clinton

Andrew Johnson became president after Abraham Lincoln was assassinated, while Bill Clinton was the president who oversaw a massive economic boom in the 1990s. What do they have in common? Both men were impeached, but neither was removed from office.

Johnson’s case grew out of the fight over Reconstruction after the Civil War, especially his clash with Congress over how the South should be rebuilt. On the other hand, Clinton’s case came from a personal scandal, centered on accusations that he lied under oath and obstructed justice during the Monica Lewinsky investigation, which involved his relationship with a White House intern.

7

Theodore Roosevelt and Franklin D. Roosevelt

Theodore Roosevelt was a president famous for his environmental conservation efforts and his "Square Deal" policies. Franklin D. Roosevelt guided America through its two biggest 20th-century crises: the Great Depression and World War II.

They were fifth cousins by blood from different branches of the New York Roosevelt family. However, the connection became even closer when Franklin married Theodore’s niece, Eleanor Roosevelt. Franklin once explained the relationship in court during Theodore Roosevelt’s 1915 libel trial, calling himself Theodore’s "fifth cousin by blood and nephew by law."

8

Theodore Roosevelt at Lincoln’s funeral

When Abraham Lincoln’s funeral procession passed through New York City in 1865, a small boy was watching from a window on Broadway. That boy was Theodore Roosevelt, not yet seven years old , standing in his grandfather’s house as the nation mourned its assassinated president.

Decades later, Roosevelt would become president himself after another assassination, when William McKinley was shot in 1901. The scene is striking: a future president watching the funeral of Abraham Lincoln decades before he would enter the White House after another president was assassinated.

9

Bill Clinton’s comeback

In 1988, Bill Clinton was a little-known governor from Arkansas when he gave the nominating speech for Michael Dukakis at the Democratic National Convention. Dukakis was the governor of Massachusetts and the Democratic nominee for president at that time. Apparently, the speech went on too long, and the crowd famously cheered when Clinton finally said, "In conclusion."

Four years later, Clinton returned to the same national stage as the Democratic nominee for president. The man who was first mocked for talking too long became one of the party’s most famous speakers. Later, he won two terms in the White House, and the rest is history.

10

General George Patton and James Dean

George S. Patton was a famous U.S. Army General who led American troops to victory during World War II, while James Dean was a legendary Hollywood actor who became a cultural icon starring in films like Rebel Without a Cause .

Exactly ten years apart, Patton in 1945 and Dean in 1955, both men were involved in car accidents. In both crashes, the vehicles were not traveling at high speeds, and the other people involved survived, but Patton, 60, and Dean, 24, were the only individuals who suffered fatal injuries.

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

The disappearance of Amelia Earhart (1937)

The first entry on our list is dedicated to a world-renowned flight pioneer, Amelia Earhart, who vanished while attempting to become the first woman to fly around the globe , leaving behind only fragments of her plane and endless speculation. Radio failure, poor visibility, and fuel issues are speculated to be contributing factors to her disappearance.

Even with modern technology and repeated searches, no one has ever found definitive proof of what happened to Amelia or her aircraft.

2

The D.B. Cooper hijacking (1971)

In 1971, Dan Cooper, a seemingly quiet man, boarded a plane in Portland, Oregon, which he promptly hijacked when the aircraft was in the air. He demanded $200,000 over the radio.

The plane landed in Seattle, where authorities met his demands. Cooper released all 36 passengers in exchange for the cash and parachutes. He then ordered the remaining crew to fly toward Mexico City at a low altitude and slow speed. Somewhere over southwest Washington, he lowered the aircraft's aft stairs and jumped into the freezing night, never to be seen again.

3

The disappearance of Jimmy Hoffa (1975)

The powerful union leader left a Detroit restaurant in 1975 and simply vanished . Witnesses last saw him standing by his car in the restaurant’s parking lot, and investigators believe he was coaxed into a car by people he recognized, thinking the meeting location had changed. He was never seen again. Searches in fields, lakes, and construction sites turned up nothing. To this day, it remains one of the most famous unsolved mysteries in American history.

Rumors range from mob connections to government cover-ups, but none have been proven. Ever since then, Hoffa’s name has become shorthand for anything that disappears without a trace.

4

The Yuba County Five (1978)

In what came to be known as "America’s Dyatlov Pass", five friends vanished after attending a basketball game in the town of Chico, California. Months later, the bodies of four members of the group were found in the mountains under mysterious conditions .

The remaining member of the original party was never located, and their strange route into deep snow remains unexplained.

5

The Sodder Children (1975)

A fire destroyed the Sodder family home in West Virginia, but five children were never found among the remains of the house. Because of physical inconsistencies at the scene and strange sightings afterward, the family always believed they survived.

Over the years, strange sightings and letters fueled hope and confusion alike, but no real evidence has ever been found. Because of these clues, the Sodders never held a funeral and instead famously erected a billboard on Route 16, offering a reward for information and keeping the case in the public eye for decades.

6

The Springfield Three (1992)

On a warm summer night in 1992, Sherrill Sherrill Levitt, her daughter Suzie, and Suzie's friend Stacy vanished from their home in Springfield, Missouri, leaving behind their cars, purses, and even the family dog .

Friends arriving the next morning found the house empty but unlocked. Despite thousands of leads, no evidence or remains have surfaced. The case remains one of the most talked-about disappearances in small-town America to this day.

7

The Gardner Museum Heist (1990)

Back in 1990, two men dressed as police officers entered Boston’s Isabella Stewart Gardner Museum and stole 13 works of art worth over $500 million .

No piece has ever been recovered. Empty frames still hang on the museum walls, a quiet tribute to one of history’s most expensive thefts.

8

The Max Headroom broadcast hijack (1987)

1980s television viewers might remember Max Headroom as a somewhat clumsy computer AI TV personality and ad spokesperson. In 1987, Chicago viewers were startled when a strange figure wearing a Max Headroom mask interrupted TV broadcasts with odd messages .

The stunt lasted only seconds, but no one was ever caught or identified. It remains one of the strangest unsolved moments in television history.

9

The Great Lakes ghost ships

Over the years, s everal ships have vanished or been found adrift on the Great Lakes , their crews gone without explanation. Cold weather, sudden storms, and superstition all play roles in the stories, but some cases defy logic. The vast inland seas are simply too big to be accessible with the current technology.

Among the most notable unsolved cases, we can mention Le Griffon, a ship that vanished during her maiden voyage in 1679, the SS Banockburn, known as the "Flying Dutchman of Lake Superior," disappeared during a storm in 1902, or the SS Chicora, a luxury steamer lost in a violent winter gale while carrying a cargo of flour, in 1895.

10

The Dulce Base Mystery

Beginning in the 1970s, a constant array of strange lights, unmarked aircraft, and talk of secret tunnels near the town of Dulce has fueled decades of conspiracy theories in this otherwise quiet area to this day.

While skeptics blame radar tests or imagination, locals still report odd sightings in the desert skies.