In the year 1971, Soviet engineers set fire to a gas-filled hole in the Turkmenistan desert, thinking it would burn out in a few days. However, to their astonishment, the flames have persisted, and the site, known as "The Door to Hell," has been burning continuously for over 52 years. 
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I learned about this and a ton of other strange and wonderful places from Atlas Obscura:
https://www.youtube.com/@atlasobscura
They also sell an actual atlas, so you can see if there is anything cool nearby when you visit somewhere.
Bitcoin mining anyone?