Six Historical Mysteries

Tonight, I tell you of several mysterious stories about places and events around the World: the Tunguska Event and the Dyatlov Pass Incident in Russia; the Antikythera Mechanism from Greece; the Roswell crash of 1947 and the D.B. Cooper Hijacking in the USA; and the Nazca Lines in Peru. Can they be described by current scientific knowledge and common sense? How did these events or artifacts challenge what we thought we knew, or reveal social preoccupations? Let's find out what can be said about each of them.