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Kauapea Beach - Kauai, Hawaii

You should never judge a book by its cover, and that's definitely the case when it comes to beautiful beaches like this one. After all, Kauapea Beach may just look like another one of Hawaii's pristine beaches, but the reality is that this beach is one of the most dangerous in the world. And locals encourage tourists to stay out of the water - unless they want to be swimming amongst fresh lava.

Andrea Izzotti via Shutterstock

Yes, this beach is so close to the active Kilauea volcano that lava spews into it on a regular basis. This, coupled with a strong underwater current, is just a disaster waiting to happen.