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Casey and Chris Keefer are on the road to El Dorado to find the lost City of Gold. English

Casey and Chris Keefer trek into the heart of Alaska to recover a plane that disappeared while carrying two American politicians. The brothers battle the elements as they attempt to solve the 47-year-old mystery.

Chris and Casey Keefer travel to Ecuador to find a colony of giants. The brothers trek through the jungle, searching high and low for clues leading to the lost civilization.

It is rumored that a secret society was responsible for emptying the Confederate treasury of 9,000 pounds of gold and silver after the Civil War; now, Chris and Casey Keefer head into the Virginia hills to find the vanished Confederate treasure.

Casey and Chris Keefer trek through snow, slot canyons and rugged terrain in pursuit of a legendary Aztec treasure said to be hidden in the mountains of Utah.

In upstate New York, Chris and Casey Keefer try to track down the lost fortune of mobster Dutch Schultz; the brothers use Schultz's final words and newspaper articles to guide them to where the notorious gangster may have buried his treasure.

Casey and Chris Keefer head to southwest Florida in search of the long-lost loot of pirate José Gaspar; the brothers leave no stone unturned as they hunt for the $30 million treasure said to be hidden somewhere along the coast.

Casey and Chris Keefer go on the hunt for a legendary silver mine said to be worth tens of millions of dollars; a cryptic journal leads the brothers into the wilds of Kentucky before sending them out West in search of the long-lost treasure.