The guys are surrounded by Africa's fiercest animals in the Zambezi basin.
Grady and Bill face strong winds and heavy snow in the Chilean Andes.
Grady and Bill struggle against the damp rainforest and their own egos.
Grady and Bill search for a river that could lead them out of the jungle.
Grady and Bill are stranded in the Namib Desert of southern Africa.
Grady and Bill fight the bitter cold in Idaho's Sawtooth Mountains.
Bill and Grady take on Oregon's rocky and arid canyon lands.
Cuba is uncharted territory for the Grady, Bill and most Americans.
Tempers flare as Bill and Grady explore remote and rocky coastal Maine.
