Though I did come up with a new beautiful place which I don't think has been posted here already:
Ilha de Queimada Grande, a 110-acre Island off the coast of Sao Paulo, Brazil
Also known as "Snake Island", as it's inhabited by thousands of venemous Golden Lancehead Vipers. Experts say they're 5 times more venemous than the regular Lancehead Vipers on the mainland, but nobody bitten by one of these snakes has lived long enough afterwards to make it back to the mainland.
Only the Brazilian Navy and Scientists with a permit are allowed to visit the island. The Brazilian Navy do maintenance work on the automated Lighthouse near the top of the place once a year or so. Legend has it the former lighthouse keeper was chased out of the place by snakes (along with his family), and they were bitten and killed by snakes as they ran through the forest. That's why it's automated now.
Nobody knows exactly how many snakes live on the island, some say it's 1 per sq. metre (which would make it around 400,000), others say some parts contain up to 5 snakes per sq. metre. More conservative estimates put the figure around 1,500 - 4000. The snakes eat insects, cockroaches, small lizards and their favourite delicacy are the migrating birds who use the place as a stop-over.