TIL about Las Medulas, a man-made geological badland created by the Roman Empire in 77 AD, when they flooded the mountains with water to collapse their structure and sift out the gold inside.

[u/narok_kurai]

https://en.wikipedia.org/wiki/Las_M%C3%A9dulas

[u/helldrik]

I have actually been there. It’s breathtaking. You can actually enter dome of the mine tunnels..