Ilha da Queimada, Brazil
Ilha da Queimada is an island ruled by animals. Popularly known as Snake Island, it is home to thousands of the some of the most venomous snakes in the world, Golden Lancehead Vipers. The Brazilian Navy has banned all civilians from the island, which is just 20 miles off the coast of São Paulo. There are between one and five snakes per square meter (3 feet).