There’s a certain lack of closure that comes from a person simply vanishing. In fact, even discovering that your friend or loved passed away might be preferable to the perpetual mystery of not knowing.

Usually, you think of someone disappearing into thin air as something that only happens in The X-Files. In real life, though, there’s always a totally logical explanation for the disappearance… right?

These 10 famous people prove that, sometimes, in spite of the best efforts of the authorities, people can—and do—simply vanish. When you read their stories, you’ll get a chill…

1. Sean Flynn: The son of legendary actor Errol Flynn and singer Lili Damita, Sean Flynn was a photojournalist who made a name for himself during the Vietnam War. In 1970, while working in Cambodia, Flynn was kidnapped by Viet Cong forces and never seen again.

2. Oscar Zeta Acosta: Known for his friendship with the late, great Hunter S. Thompson, Oscar Zeta Acosta was a writer and a political activist. In 1974, Acosta left his home to go on a trip to Mexico and mysteriously never returned from the adventure.

3. Theodosia Burr Alston: The daughter of former Vice President Aaron Burr (known for firing the shot that would end the life of Alexander Hamilton), Theodosia Burr Alston boarded a ship in 1812 to be reunited with her husband in England. The ship never made it across the Atlantic—and what happened to it remains a mystery to this day.

4. Henry Hudson: A famous explorer, Henry Hudson left behind an impressive legacy. The Hudson River is named after him, for crying out loud! Unfortunately, on the hunt for the Northwest Passage in 1610, his crew mutinied and left him literally upriver in a small row boat along with his son. They were never seen again.

5. Solomon Northup: Born a free man in New York in the early 1800s, Solomon Northup was kidnapped and sold into slavery. He was eventually freed and wrote a book about his experiences called 12 Years A Slave. During a lecture tour in 1857, while visiting Canada, he vanished once again. This time he never came back.

6. Heinrich Muller: One of the most reviled figures of World War II, Heinrich Muller was a devoted Nazi who helped justify the invasion of Poland and the Holocaust. Then, he vanished in 1945. Many believed he died; the CIA conducted a search for him or his remains, but came up empty.

7. Harold Holt: A primary leader of the Australian conservative political party, Harold Holt became Prime Minister of Australia in 1966. In 1967, he went for a swim at one of his favorite beaches and never returned to shore.

8. Jimmy Hoffa: The leader of the corrupt Teamsters Union, famed mob boss Jimmy Hoffa was eventually sent to jail for his crimes in 1967. After being pardoned by President Richard Nixon, he was slated to meet two other prominent organized crime members at a Detroit restaurant. Though his car was found running outside, Hoffa himself was gone and was never seen again.

9. Glenn Miller: During the 1930s and 1940s, Glenn Miller’s music defined the Big Band era. Then, in 1944, he joined the Air Force and boarded a plane headed for France. Sadly, however, the plane disappeared over the English Channel and was never seen again.

10. Amelia Earhart: Perhaps the most famous case of a missing person ever recorded, Amelia Earhart went missing during her attempt to circumnavigate the globe by plane. Her plane is presumed to have crashed. What really happened to her, however, is still a mystery.

Isn’t it crazy to think that these super-famous people just one day up and vanished? Who knows? Maybe one day these haunting mysterious will finally be solved.

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