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Mariana Trench, Pacific Ocean

If there's one thing we should have learned from our ancestors, it's that the ocean isn't only pretty. No, no. It's also cruel and unforgiving. After all, the ocean has been a grave to many. That's why it shouldn't come as a surprise that it's filled to the brim with a bunch of zones too dangerous to even set foot (or sail) in. The Mariana Trench is just one of those places.

Wikimedia Commons

It is the deepest part of the ocean yet discovered, and its only bubbles of carbon dioxide and sulfur have been spotted making their way to the surface — quite the no-go zone.