David Adams treks to Tinhri, the heart of the Sahara, where he survives the 120 degree temperatures, skis down a 1000-foot sand dune and joins a desert caravan.

Following in Marco Polo's footsteps, photojournalist David Adams travels to Iran in search of an ancient religious sect.

David Adams climbs high into the Ethiopian Cush, a place known as the "Land of Ghosts," to search for the Lost Ark of the Covenant.

David Adams takes a sail-powered journey along the coast of Kenya to Zanzibar in search of the world of Sinbad the Sailor in "The Arabian Nights.".

Photojournalist David Adams searches for legendary Siberian wild men in a zone that has been off limits to the world for most of the 20th century.

David Adams goes on his journey to Puncuyoc, sacred Sister City of Machu Picchu; the city sought but never found by Hiram Bingham.