The “door” is a huge, gas-filled crater that’s been burning nonstop since it was lit by Soviet scientists in 1971.

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The remains of over six million people are found in Paris’ dark, labyrinthine underground tunnels.

Natural sinkholes that were literally used for sacrifices by the ancient Mayans.

Found deep in the forests of Ukraine, the Tunnel of Love was formerly used to transport industrial goods from a nearby factory.

It was once thought to be the result of an asteroid impact, but it’s now argued to be a deeply eroded geologic dome. The Richat Structure is also known as the Eye of the Sahara and is visible from space.

The former home of the Bulgarian Communist Party is now an abandoned saucer-like structure atop a mountain.

Located in the Quinta da Regaleira palace, The Initiation Wells are two underground towers that were once used for ceremonies, including Tarot rites.

Also known as the Suicide Forest or Sea of Trees. Mount Fuji towers over this eerie forest.

Vast networks of underground chambers and tunnels, some of which bear Byzantine frescoes. Incredible.

This volcanic crater, which has a history of human sacrifice, was referred to as the “Mouth of Hell” by the conquistadors.

A normal wooden bridge would quickly rot in Meghalaya’s subtropical climate — but these bridges consist of ancient tree roots and vines, and they’re very much strong and alive.

A former diamond mining town in the Namib Desert where geological forces have buried many houses in sand.

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