scary

Here's another reason never to go swimming:

This rare form of parasitic meningitis—primary amebic meningoencephalitis (PAM)—is caused by an amoeba called Naegleria fowleri. That microscopic amoeba—part of the class of life called protozoans—is a naturally occurring organism that normally feeds on bacteria and tends to live in the sedimentary layer of warm lakes and ponds.

Ilha de Queimada Grande has everything, if your definition of everything is deadly snakes.

This is one island you wouldn't want to find yourself shipwrecked on. Ilha de Queimada Grande, a small 110-acre island off the coast of São Paulo, Brazil, is home to more than 4,000 deadly snakes, earning it the nickname of 'Snake Island.' Some reports suggest you can find one snake per square meter here. It might just be the deadliest island on Earth, according to the Huffington Post.

Even more terrifying, the island is the only known home of the golden lancehead (Bothrops insularis), one of the most venomous vipers in the world. The snake's venom is three to five times more potent than the venom of any snake found on the mainland, and it is apparently capable of "melting human flesh." Ophidiophobe or not, you'll want to stay away from this serpent.