10. “Gates of hell”, Turkmenistan
This frightening yet somehow fantastic 70 meter wide phenomenon can be found in the middle of the Karakum Desert. Caused by Soviet geologists drilling into a cavern in 1971 the ground had collapsed due to a build-up of natural gas. This large gate of inferno appeared after attempting to set ablaze. The poisonous gas discharge in hopes it would burn off. However, the blazing breath of this pit is still flaming on to this day.