Expedition Unknown, Season 4

Josh sets off for gold rush country to search for the lost fortune of a notorious Montana sheriff. During his investigation, Josh explores hidden cave systems and blows open a mine that's been sealed for over a century.

Josh travels to Hungary to join three archeological teams looking for the lost tomb of Attila the Hun. Legends and ancient texts lead the search from the bottom of the Danube to the mountain forests just outside of Budapest.

On the Mediterranean island of Crete, the Minoans built one of the most glorious civilizations in the ancient world and then mysteriously vanished. Josh travels to Greece to find out how Europe's first superpower disappeared.

Josh Gates joins leading archeologists as they investigate America's first missing-persons case, The Lost Colony of Roanoke. Following newly discovered clues, he digs for answers to this over 400-year-old mystery.

To help clone the extinct woolly mammoth back to life, Josh visits a Korean biotech lab driving the project and excavates ancient bones in a Canadian mine. He then descends into a vast sinkhole in Siberia to unearth frozen DNA.

Josh treks deep into Siberia for a site where priceless mammoth bones are mined out of the permafrost. Once he gets back to the lab, Josh views the DNA results to find out if the woolly mammoth will walk the earth again.

Josh sets off on an expedition to crack the mystery behind the perpetrator of the only unsolved plane hijacking in US history. Picking up where the FBI left off, he discovers new clues and theories in the Pacific Northwest.

Josh goes on an epic journey through the Australian Outback to find a legendary field of gold known as Lasseter's Reef.

Josh ventures to Australia's island state of Tasmania to investigate sightings of a supposedly extinct marsupial known as the Tasmanian Tiger.

Josh Gates plays his hilarious traveling trivia game in Greece. This special episode features behind the scenes extras, expanded scenes and highlights from his investigation into the lost civilization of the Minoans.

Josh takes a turn as a game show host in "Global Game Show: Without Borders." He quizzes fellow travelers as he explores the globe and shares behind-the-scenes extras from some of his most recent adventures.

Josh plays game show host as he presents highlights, expanded scenes and behind-the-scenes extras from his investigations into two Australian legends.

Josh retraces the footsteps of Captain Kidd in the hopes of finding his buried treasure. From the East Coast to the Caribbean, the search takes him to a real pirate shipwreck and to the island hideout of the notorious buccaneer.

Josh journeys to the wilds of Namibia to embark on a treacherously deep dive in Lake Otjikoto for a long lost World War I treasure.

Josh follows in the footsteps of Indiana Jones as he searches in Israel and Ethiopia for the lost Ark of the Covenant, the sacred relic said to contain the Ten Commandments and possess extraordinary powers.

Josh goes on a quest to find the legendary lost treasure of King John. He explores the deadly marshlands of England to find the despised king's crown jewels, which were swept away in a freak tidal surge in the 13th century.

Josh hunts for the treasure of Erwin Rommel, a Nazi general who plundered the wealth of North Africa as his tank corps fled the continent. The search brings Josh to never-explored underground lakes and undersea relics of WWII.

Josh travels to Italy in search of what may be history's richest treasure -- the looted relics of the Roman Empire interred with the Visigoth king Alaric.

Josh travels to India in search of Dwarka, a mythical kingdom swallowed by the ocean. To find find evidence that the golden city is real, he dives into the Arabian Sea and visits a dig site that could rewrite history.

Josh travels the coast of Florida and to the newly opened country of Cuba in search of sunken treasure from a fleet of Spanish ships sunk in 1715.