Watch Expedition Unknown

The hunt for alien life continues in Zimbabwe, where Josh interviews witnesses from one of the largest UFO sightings in modern history. Then, in England, he investigates the infamous case that has become known as "Europe's Roswell."

Josh's journey continues on remote Easter Island, where ancient alien theorists believe extraterrestrials visited a millennia ago; the site of a recent meteorite strike in Zimbabwe that could prove life on Earth began in outer space.

A once-in-a-lifetime visit to NASA; evidence of aliens in Chile; a UFO video captured by the military; the largest telescope on Earth.

From the Mayans of the Yucatan Peninsula to a civilization that disappeared so suddenly they have no name, Josh Gates travels to Texas to quiz contestants on empires that vanished from history for a chance to win cold, hard cash.

Josh Gates revisits his search to find the legendary lost treasure of King John; exploring 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 Gates revisits his treks north of the Arctic Circle to search for the DNA of the long-extinct woolly mammoth; a mile-wide sinkhole in the Siberian permafrost; a black-market mining camp where tusk hunters dig for mammoth ivory.

Josh Gates revisits his quest for the lost Ark of the Covenant, the sacred relic said to contain the Ten Commandments and possess extraordinary powers.

Josh Gates revisits his dive into the Lajas Reef off Panama's coast in search of treasure chests on the sunken flagship of legendary pirate Captain Morgan.

Josh Gates revisits his hunt for the hidden treasure of Erwin Rommel, a Nazi general who plundered the wealth of North Africa as his tank corps fled the continent.

Josh Gates shares his favorite moments from season three that didn't make the final cut, including never-before-seen footage, expanded scenes and more.

After three seasons of traveling the globe in pursuit of excitement and discovery, Josh Gates counts down his top 10 greatest adventures -- and misadventures. He also shares a rare glimpse behind the scenes and never-before-seen moments.

Josh revisits his most exciting discoveries from the past three seasons and reveals new developments in this one-hour special.

Josh Gates treks north of the Arctic Circle to search for the DNA of the long-extinct woolly mammoth. The hunt takes him to a mile-wide sinkhole in the Siberian permafrost as well as a black market mining camp where tusk hunters dig for mammoth ivory.

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.

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

To find the plundered riches of the Roman Empire, Josh Gates must locate the tomb of the Visigoth king Alaric in Italy; the hunt extends from the capital of Rome to the southern city of Cosenza.

Josh hunts for the hidden treasure of Nazi general Erwin Rommel.

Josh Gates goes on a quest to find the legendary lost treasure of King John; exploring 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 Gates 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 Gates 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 plays game show Down Under with this travel trivia special.

Josh channels his inner game show host as he quizzes his fellow travelers.

Josh Gates plays his hilarious traveling trivia game in Greece.

Josh Gates ventures to Australia's island state of Tasmania to investigate sightings of the supposedly extinct Thylacine, also known as the Tasmanian Tiger.

Josh Gates sets off deep into the Australian Outback, following the footsteps of legendary explorer Harold Lasseter, who claims to have found a vast field of gold.

Josh Gates sets off on an expedition to crack the mystery behind the perpetrator of the only unsolved plane hijacking in US history.

Josh retrieves bone samples from the massive Batagay crater and gets DNA results to find out if the woolly mammoth will walk the earth again.

Intending to clone the woolly mammoth, Josh searches for its DNA.

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

Josh travels to Greece to explore Europe's first superpower and how it disappeared on the Mediterranean island of Crete.

Josh Gates travels to Hungary to join three separate 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.