Produced by: BT Desk
Edmund Hillary and Tenzing Norgay scaled the summit on May 29, 1953. But another theory suggests it was scaled in 1924 first by Britishers Andrew Irvine and George Mallory. They were last seen alive a few hundred metres from summit. Only Mallory's body was found in 1999.
On December 5, 1872, the British ship Dei Gratia found the Mary Celeste abandoned. The 10 passengers and crew aboard the vessel just vanished. What happened on board the ship has remained a mystery.
The 600-year-old Voynich Manuscript is one of the most mysterious books in the world. It has a mysterious codex that contains a series of illustrations and writings represening an unknown language that could be clue to a secret society.
Alexander the Great died in 323 BC, felled by an illness in Babylon. Historical documents suggest a tomb was built for him in Alexandria. However, no one knows exactly where that iconic tomb is located.
Credit: Staatliche Museen zu Berlin
There are several sites in Britain that legends link to King Arthur but excavations have not confirmed whether Arthur ever lived there or even existed.
In 1888, Jack the Ripper killed at least five women in London, mutilating their bodies. A theory posits he was a member of the royal family or someone with connections, which could explain why he was never caught.
The teamster union leader was declared legally dead in 1982. The identity of his killer(s) and the location of his body are ongoing mysteries.
Cleopatra VII and her lover, Mark Antony, were 'buried together' in a tomb after their deaths in 30 B.C. The tomb located near a temple of Isis had treasures made of gold, silver, emeralds, pearls, ebony and ivory. The location of the tomb remains a mystery.
In 587 BC King Nebuchadnezzar II plundered Jerusalem and destroyed the First Temple, which carried the 10 Commandments. The fate of the ark is unclear. Ancient sources indicate that the ark was either carried back to Babylon or hidden before the city was captured.
The Holy Grail, the cup that Jesus drank from at his last supper with his disciples before his crucifixion, has never been found. Some stories suggest that it was brought to Britain by Joseph of Arimathea.