The Gates to Hell
We don’t mean to continue the whole “hell” theme here, but the closest thing that resembles the actual doorway to hell may actually exist in this world. Specifically, it’s in the nation of Turkmenistan, and manifested in the early 1970s when a gas field collapsed into an underground cavern. In order to prevent the spread of methane gas, the cavern was set on fire. About the size of a football field, the crater still burns today, making for a popular tourist attraction.