Exploring The Unknown spans across history and the world to spotlight things mystical and amazing, from Stone Age secrets etched in the cave of Altamira, through the reign of visions and spirits in the Age of Reason, to riddles that still boggle the best minds. Throughout, haunting vintage photographs and striking full-color illustrations bring astounding phenomena dramatically to life.
-- See the Great Serpent Mound in Adams County, Ohio -- an ancient, endlessly baffling earth effigy of a humongous snake with gaping jaws.
-- Witness the wondrous levitations performed by Saint Joseph of Cupertino in 17th century Italy -- and the powerful poltergeists of the day that literally swept a French lawyer off his feet.
-- Meet the ghosts of Flight 401 -- the apparitions of two pilots who were reported to haunt aircraft for months following their fateful crash in 1972.