Derinkuyu: a guy knocked down a wall in his basement and found a city for 20,000

Cappadocia, Turkey, 1963. This is documented, not folklore. A local was renovating his house, sledgehammered a wall, and behind it was a tunnel. That tunnel led down into Derinkuyu — an underground city carved into soft volcanic tuff, eight levels deep (some say 18 levels exist), roughly 60m down. S……