Casey and Chris are on the road to El Dorado. Using clues left behind by Percy Fawcett, they head deep into the Amazon in search of the lost City of Gold.

Chris and Casey Keefer enter the Alaska Triangle to explore new leads into the 1972 disappearance of a Cessna aeroplane carrying government officials Hale Boggs and Nick Begich.

Chris and Casey Keefer travel to Ecuador in search of a colony of giants. They trek through the dense jungle, looking for clues leading to the lost civilisation.

The brothers head to Virginia on a quest to find a long-lost Confederate treasury. They trek through unforgiving terrain to try to solve the mystery.

The brothers trek through snow and relentless terrain in pursuit of a legendary Aztec treasure. What is rumoured to be hidden in the Utah mountains?

Chris and Casey Keefer are in New York tracking down the lost fortune of Dutch Schultz. The brothers use Schultz's final words to guide them.