Amazing Underground Secrets--Part 1
Discover the treasures of the natural underworld including the incredible glow worms in New Zealand's Waitomo Caves.
Perilous Journeys--The Roof of Africa
Host Marsh Mokhtari attempts a treacherous winter ascent of the notoriously rugged Sani Pass, but things get worse as he...
Amazing Underground Secrets--Part 2
Descend a flight of steps to reveal a secret hidden in an Italian well, see how a century-old dream has been fulfilled...
Perilous Journeys--Into the Lost Jungle
Travel to one of the last wild frontiers in the world, Panama's legendary Darien Gap.
Amazing Underground Secrets--Part 3
Learn how the underground world has been used to hide everything from buried treasures to government secrets.