Just off the coast of Brazil, this snake infested island lives up to its name and is off limits to visitors courtesy of the Brazilian Navy. The island is home to thousands of golden lance-head snakes. As the island is devoid of ground based prey, these vipers evolved to catch and instantly kill birds that land on the isle for rest. Their venom can kill a human within an hour. Their used to be a lighthouse keeper stationed on the island, but legend says the last one was killed when snakes slithered in through his bedroom window.