The Dyatlov Pass incident: nine hikers found dead in the snow and no explanation that fully closes the case
Kholat Syakhl, Sverdlovsk Oblast, Russia, 1959 Under debate
The Echoes of the Past team
Dwarka: the city the Mahabharata says sank, and what archaeology found in the sea
Dwarka and Gulf of Khambhat, Gujarat, India, 1,500 BC Under debate
The Man in the Iron Mask: an identity hidden for 34 years
Pignerol, Sainte-Marguerite, and the Bastille (Paris), France, 1669 Under debate
The Dancing Plague of 1518: four hundred people who couldn't stop dancing, and some died trying
Strasbourg, Alsace, France, 1518 Under debate
Nan Madol: the city built on the ocean that the world forgot for centuries
Nan Madol, Pohnpei, Micronesia, 1100 Partly explained
Cagliostro: the alchemist who fooled kings, or the man who knew things he should not have known
Europe, from Palermo to San Leo (Italy), 1791 Under debate
The Battle of Los Angeles, 1942: fighting an enemy that didn't exist, or that no one identified
Los Angeles, California, United States, 1942 Partly explained
Derinkuyu: the 18-level underground city hidden beneath an ordinary house
Derinkuyu, Cappadocia, Turkey, 800 BC Partly explained
D.B. Cooper: the only unsolved hijacking in American history and the hijacker who vanished into thin air
Southwestern Washington State, United States, 1971 Open
The Plague of Athens: the disease that destroyed the greatest Greek empire and that no one has yet identified with certainty
Athens, Greece, 430 BC Under debate
Easter Island: the moai, the collapse of a civilization and the script no one has deciphered
Easter Island (Rapa Nui), Chile, 1722 Partly explained
Nicolas Flamel: the medieval scribe who grew too rich and left a testament no one can explain
Paris, France, 1382 Partly explained