1. The Danakil Desert, Eritrea, Ethiopia
It’s hard to imagine why anybody would want to spend a vacation in this literal “Hell on Earth” where temperature can reach 120F (50C) and volcanic eruptions that spew deadly gases into the air are everywhere. But it happens. However, if you think you’re going to manage to travel there solo, think again. The Eritrean government doesn’t cotton to your particular brand of crazy. It’s only possible to go there with an experienced guide.