10. Snake Island, Brazil

While you might be sad that you can't visit some destinations on this list, this is definitely not one of them. Ilha Da Queimada Grande, Brazil, better known as Snake Island, is just 93 miles off the coast of Sao Paulo, and it is home to a sickening amount of snakes—between one and five snakes per ten square feet to be exact. 

Among these snakes is the golden lancehead viper, whose venom melts the skin around the bite. It's probably for the better that people aren't allowed to go here, even though we can't imagine anyone would want to. The snakes only got there when sea levels rose and covered the land that connected the island to the mainland.