“U” Is for the underground city of Derinkuyu in Turkey. It’s only one of the most famous of them, there are quite a few others in the area (200+). They are very old. Derinkuyu is supposed to be at least 2000 years old. I was impressed with the amount of work it took to carve out the huge labyrinths of rooms, tunnels, wells, and even defensive falling stones. All underground. All done without electric lights, or power tools.
The people lived their lives down there. Their whole families, even their animals (sheep, goats, donkeys, chickens, etc). I kept wondering how much smaller than us they must have been. I barely made it through some of those tunnels, and was really glad to get to one of the larger spaces.
It’s hard to imagine how someone could spend so much of their lives below ground like that. No wind, no sun, no rain. I don’t think they lived like that all the time. Just for especially dangerous times. But it must have been pretty dangerous a lot of the time to make it worth all that effort, right?