2. Ilha da Queimada Grande, or Snake Island
On Snake Island, located off the coast of Sao Paula, Brazil, you will find at least one snake every square meter; in perspective, for every second step you take, you for sure will step on a snake or certainly (Ilha da Queimada Grande) be bitten by one. The most common snake found on this island is the critically endangered golden Pitviper, with a bite that delivers hemotoxin venom.
In order to protect the viper, this island was sealed off by the Brazilian navy and is now closed to the general public. Scientists and explorers studying the golden Pitviper may visit the island, but after obtaining special permissions.