There is a mysterious island just 20 miles off the coast of southeastern Brazil that is so infested with deadly snakes that no one is allowed there other than a few select scientists. Snake Island (Ilha da Queimada Grand) is the only place on earth where you can find rare golden lancehead vipers – one of the deadliest snakes known to man. Learn the secrets of the notorious Snake Island and the legions of deadly snakes that call it home in this terrifying video!