#9. Mt. Fuji, Japan 3,776.24 metres (12,389 ft.)
Sometimes you don’t have to be a tall mountain to be a lethal one. Take Mt. Fuji, for example. At its base sits the Sea of Trees, a large expanse of cedar, pine, and boxwood trees that was the only area not overrun by lava and ash during a massive eruption in 1707. This forest, know as Aokigahara, has attained cult status among Japanese as the perfect place to die.