This Day In History: 04/26/1986 - Disaster at Chernobyl

Alcatraz was built to hold America’s most dangerous criminals, but some say its dead never escaped. From phantom footsteps to haunted cells, do the spirits of inmates and guards still linger inside the prison known as The Rock?

Discover places across the country where strange phenomena are common in this clip from The UnBelievable.

In 1890, medium Helen Peters helped give the Ouija board its name. But after the board accused a relative of theft and tore her family apart, she spent the rest of her life warning others that its answers might not be truthful.

A failed oil rig causes an environmental disaster, while a NASA miscalculation dooms a Mars satellite—two costly mistakes with multimillion-dollar consequences.