Madidi National Park
Bolivia’s Madidi National Park is one of the most scenically beautiful and biodiverse parks in the world, but one particular hang up causes it to fall into this list. Madidi National Park is one of the most poisonous places on Earth. This small mountainside forest contains the largest population of poisonous frogs and spiders in the world, and if they don’t kill you, the poisonous plants will. Even the waterways there are laden with poisonous pollen and aggressive fish that will cut your vacation devastatingly short.