Season 4

From Denmark and Iceland to the United States and Canada, Josh Gates treads into Viking territory in an effort to unlock answers to their most enduring secrets, including how they attained and sustained their power and how far they really traveled.

Josh traces the Vikings' westward expansion from the volcanic landscape of Iceland to a mysterious settlement in Greenland; he aims to find out if the Vikings landed in the United States more than 500 years before any other Europeans.

Josh travels to his ancestral home of Great Britain to explore the origins of Stonehenge. From high in the air to deep under the sea, he finds an unexpected network of monuments that could have inspired one of history's most mystical locations.

Josh travels across the United States to find the treasures featured in the cryptic 1982 book "The Secret"; Josh meets with members of the book's cult following, who each think they are on the verge of locating one of the 10 remaining treasures.

Josh immerses himself in Wild West lore on a quest to find Butch Cassidy's missing money; he traces the iconic outlaw's footsteps through Colorado, Utah and Nevada, eventually learning he may have to find the man himself to locate the lost loot.

Josh travels through the jungles of Ecuador to explore the watery depths of Tayos Cave for a legendary set of metal plates believed to be created by an advanced ancient civilization.

Josh journeys through the land of the Nile to uncover the buried secrets of three of the most powerful and elusive women in ancient Egypt -- Hatshepsut, Nefertiti and Cleopatra.

Josh Gates continues his journey through Egypt to unearth the secrets and possibly the final resting places of Nefertiti and Cleopatra.

Josh Gates' Global Game Show goes all over the planet but this time he's going out of this world by giving his contestants the opportunity to win big on the topic of extraterrestrials. Players at home can win a big prize too, plus a bonus look at footage that never aired in the original Expedition Unknown episodes.

Josh Gates attempts to uncover a treasure left behind by the Aquarian Foundation, an isolated, insidious cult led by the notorious leader known as Brother XII.