1; Frederick Valentich:
What is known as the "Valentich disappearance" is a strange occurrence in the annals of UFOlogy that took place in 1978. The curious case of Frederick Valentich has been called Australia's most famous aviation mystery and that's not because he disappeared up in the skies, but because his final radio transmissions reported a UFO sighting. Ever since, a subculture of Australians, notably including Valentich's father, believe he was abducted by aliens and may still be alive somewhere.
2; Legio IX Hispana:
One of the biggest mysteries in history is the disappearance of the Ninth Legion, lost in the fogs of Britain during a military campaign. Of the five thousand legionnaires, not a trace of one has ever been found, nor has any spear or shield, or anything else for that matter turned up to indicate that there had been a battle. It's as if the earth had opened up and swallowed them.
3; Flight MH370:
In what is considered the biggest mystery of the twenty-first century, Malaysia Airlines Flight 370 was a scheduled international passenger flight that disappeared on March 8, 2014, while flying from Kuala Lumpur International Airport in Malaysia, to Beijing Capital International Airport in China. Despite various claims and theories that pop up from time to time, the mystery remains unsolved and no logical explanation has yet been given.
4; The Ghost Crew of the MV Joyita:
The MV Joyita was a merchant vessel from which twenty-five passengers and crew mysteriously disappeared in the South Pacific in 1955. The boat was found adrift and in very poor condition, with corroded pipes and a radio that, while functional, only had a range of about two miles due to faulty wiring. To this day, no evidence of the whereabouts of the missing has surfaced.
5; Lieutenant Felix Moncla:
On November 23, 1953, one of the greatest UFO mysteries occurred, as an Air Defense Command Ground Intercept radar controller at Truax AFB in Madison, Wisconsin, discovered a radar blip of an unknown object over Lake Michigan. An F-89C Scorpion was immediately dispatched from Kincross Air Force Base to locate the target. First Lieutenant Felix Moncla Jr. piloted the jet, with Second Lieutenant R. Wilson operating the radar. Wilson would later claim that on the radar Moncla's aircraft merged with the UFO, at which point they both disappeared. A search-and-rescue team turned up nothing and no debris or wreckage was ever found from either aircraft. Moncla and his plane vanished in what is one of the most curious and mysterious disappearances of all time.
6; "D. B. Cooper":
The legendary skyjacker known to the public as D. B. Cooper committed one of the most impressive robberies in history when he stole a ransom of $200,000 and then parachuted from the rear stairs of a Boeing 727 at a height of 10,000 feet over the Pacific Northwest, somewhere between Seattle and Portland, Oregon, on November 24, 1971. He was never seen again and no trace of him has ever been found.
7; Adolf Hitler:
Arguably the most notorious madman of the twentieth century, Hitler had one of the most enigmatic ends as well. According to the mainstream version of history, on April 30, 1945, after intense street-to-street combat, when Soviet troops were within a block or two of the Reich Chancellery, Hitler shot himself and Braun bit into a cyanide capsule. Their bodies were supposedly set on fire and their corpses never found, a fact that still fuels many theories about Hitler's and his wife's fates.
8; Sebastian of Portugal:
The body of Sebastian, the Portuguese king, was never found after the Battle of Alcácer Quibir in 1578. Many Portuguese believed their king had survived the battle and would return to claim his throne. The belief that Sebastian would return at any moment to help Portugal in its darkest hour later became part of local folklore and myth.
