Marsh Mokhtari takes a white-knuckle journey through India's majestic Himalayan mountain range over one of the world's highest motorable passes.

Marsh Mokhtari is in Canada's Northwest Territories where he travels on an ice road to the northernmost village on the Canadian mainland.

Marsh attempts a treacherous winter ascent of the notorious Sani Pass. From there it only gets worse as he faces the highest road in Africa.

Marsh travels into Panama's infamous Darien Gap – a primeval jungle inhabited by a variety of dangerous wildlife as well as Colombian guerrillas.