1

Rosa Parks

Amid the fight against racial segregation in 1955, activist Rosa Parks rebelled against authority in an act of courage that went on to become a defining moment in America’s Civil Rights history . She was sitting on a bus alongside three other Black passengers when the driver asked them to give up their seats so a white passenger could sit. Parks refused to do it and was arrested.

This single act of bravery triggered the Montgomery Bus Boycott, which not only helped bring Martin Luther King Jr. to national prominence but also helped put pressure on the U.S. Supreme Court, which later upheld a lower court ruling that segregation on Montgomery’s public bus was unconstitutional.

2

Amelia Earhart

Looking back at Amelia Earhart's story is fascinating, but understanding the context in which she achieved those feats is even more incredible. She broke aviation records at a time when women were still not socially accepted in male-dominated fields .

Earhart became the first woman ever to fly solo across the Atlantic Ocean in 1932, the first woman to fly solo nonstop across the U.S., and the first person to fly solo from Hawaii to California. Earhart tragically disappeared in 1937 during an attempt to become the first woman to fly around the world, though her legacy inspired countless people to pursue their dreams no matter their gender.

3

Harriet Tubman

Harriet Tubman's life story is one of the clearest examples of heroism in this country’s history. She not only rejected the life she had been forced to live as an enslaved person and escaped to Pennsylvania in 1849, but she also gave up the safety she had found in the North and returned to the South to continue fighting for her people’s freedom .

Tubman is mainly known for being one of the conductors of the Underground Railroad, a secret network that helped thousands of enslaved people escape to the free states and Canada. She also worked for the Union Army during the Civil War and became involved in the women's suffrage movement afterwards.

4

Helen Keller

How did a young girl who had lost both her sight and hearing due to a terrible illness become an accomplished writer, speaker, and activist? It all started with her teacher, Anne Sullivan, and her revolutionary approach by which she taught Helen to communicate using fingerspelling, relying on manual finger-spelling pressed directly into the girl’s palm.

This enabled Keller to learn Braille later and eventually speak, but that wasn’t enough for her, and she also went on to become the first deafblind person to earn a bachelor’s degree in 1903 (at Radcliffe College). Her story is not only about overcoming barriers, but about helping and inspiring others in similar situations to overcome them.

5

Susan B. Anthony

When it comes to the women’s suffrage movement, Susan B. Anthony is a name that stands out. She was a relentless civil rights activist who challenged authority regardless of the consequences. In 1872, she deliberately voted in the presidential election even though women were not legally allowed to, and was arrested and tried.

She fought for women’s rights until her final days and, unfortunately, didn’t live long enough to see the fruits of her work, which came in 1920 with the ratification of the 19th Amendment, fourteen years after her death at age 86.

6

Eleanor Roosevelt

The First Lady who stepped up and refused to just be in the background : that’s Eleanor Roosevelt, someone who transformed her socially expected passive role into a much more active platform for social causes.

Using her position as a First Lady (from 1933 to 1945), she advocated for civil rights, women’s rights, workers’ rights, and the rights of people living in poverty, challenging the status quo. Among the many causes she participated in, Eleanor also chaired the UN Commission on Human Rights and played a key role in drafting the 1948 Universal Declaration of Human Rights.

7

Clara Barton

Clara Barton, aka "The Angel of the Battlefield," was a central figure during the Civil War and was later responsible for saving thousands of lives through the creation of the American Red Cross .

She helped wounded soldiers, collected and distributed medical supplies to Union soldiers, and even went directly onto battlefields to care for troops. And after the war, she dedicated her life to helping people affected by disasters.

8

Maya Angelou

Maya Angelou’s powerful and moving I Know Why the Caged Bird Sings (1969) was one of the first autobiographies by a Black American woman to achieve widespread recognition, and her story became a symbol of resilience and dignity .

Angelou worked closely with Martin Luther King Jr. in the civil rights movement. She was also an actress and a singer, and in 2011, President Barack Obama awarded her the Presidential Medal of Freedom.

9

Katherine Johnson

Katherine Johnson’s story wasn’t widely known until the 2016 film Hidden Figures (where she was portrayed by Taraji P. Henson) , which introduced modern audiences to the fascinating contributions of this mathematician, whose calculations were crucial to some of the United States’ earliest crewed space missions and whose career helped break barriers for women and Black Americans.

Her work was partly responsible for the success of the Apollo missions (1969 to 1970) and the development of the Space Shuttle program through the 1970s and early 1980s, and while she wasn’t an activist, the fact that she became one of NASA’s most respected mathematicians challenged the norm and inspired social change.

10

Billie Jean King

The four biggest tennis tournaments are known as Grand Slams, and Billie Jean King racked up 39 — but that wasn’t even her best achievement. King’s biggest battle was against the inequalities women faced in sports , where she played a major role in turning things around.

She was responsible for the creation of the Women’s Tennis Association in 1973, co-founded the Virginia Slims Circuit, which provided professional opportunities for women in tennis, and played in the legendary "Battle of the Sexes," where she defeated Bobby Riggs in front of roughly 90 million viewers worldwide.

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.