A man in Turkey discovered a hidden underground city after breaking through a wall in his basement. Derinkuyu, the largest excavated underground city in the world, served as a refuge for up to 50,000 people and features 18 levels and 600 hidden entrances.
image sourced from original article at https://www.jpost.com/archaeology/article-852125Original article source: https://www.jpost.com/archaeology/article-852125
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