Derinkuyu, yeraltı şehri: Derinkuyu, underground city

What do you do when endless invading armies sweep through the land? Go underground, 85km underground! Make some tunnels from your regular homes above, dig some wells, create airshafts, devise some traps, and you've got yourself a solution!
Climbing / crawling through these tunnels was quite the adventure. Sometimes the pathways were so narrow and low that the backpack got in the way. The guide helpfully told us not to get lost, but if we did to follow the blue arrows back up to the surface. Coordinating all the people in the tour groups was a trick, too. The guides would run ahead to see if anyone was coming, and then shout for people to follow. It was much cooler underground, which was a relief... given the blazing sun outside.
People used the underground city from the 4th century BC to the 1950s when it was transformed into a museum.




The deepest airshaft in the eighth floor down...