8. Rainforests of the Atsinanana, Madagascar
The six national parks that comprise the rainforests of the Atsinanana are some of the most ecologically diverse places on the planet. Because the island broke off from the Gondawana supercontinent over 70 million years ago, the flora and fauna of Madagascar developed in isolation. Most of the plants and animals on the island today are found nowhere else in the world. Dozens of species of lemur, Madagascar’s most iconic animal, roam these forests. Most of these are, sadly, endangered. That, along with rampant illegal logging, mining, and human encroachment, are all threatening these unique habitats.