Turkey’s underground city of 20k people Posted by travisgriggs on Wednesday August 10, 2022 @11:50PM from the bbc.com dept. https://www.bbc.com/travel/article/20220810-derinkuyu-turkeys-underground-city-of-20000-people ( 1 comment | 6 points | on HN )
or more realistically, to hide from violent sieges on the city