This guy was knocking down a wall in his basement, and uncovered an entire hidden city.
In 1963, a homeowner in central Turkey was renovating his house, he noticed a small opening behind a wall. Curious, he broke through, and found a narrow passage leading deep underground.
What he had stumbled upon was Derinkuyu Underground City, a vast subterranean city hidden beneath the region of Cappadocia.
It was an entire underground world.