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.
According to staff at Willis Tower, the cracked portion you see here was a part of the safety seal of the observation platform and not the glass itself. Still, that's the last thing you want to see when you're suspended that high in the air.