Explore our comprehensive collection of unsolved mysteries from around the world.
Unidentified woman found in Norway's Isdalen Valley.
Man hijacked a plane, parachuted with ransom money, never found.
Serial killer who terrorized Northern California.
Unidentified serial killer in London's Whitechapel district.
Nine hikers died under mysterious circumstances in the Ural Mountains.
Unidentified man found dead on Somerton Beach.