The incredible thousand-year-old UNDERGROUND 18-storey city that could house
20,000 people and was discovered by chance when a man was doing DIY on his house in Turkey
In 1963, a Turkish man in the region of Cappadocia was making improvements to his home when he made an incredible discovery. After knocking down a wall in his basement, he stumbled upon a secret room, which led to an underground tunnel, which opened up into a completely hidden ancient city: Derinkuyu.
Photos of the preserved city reveal how 20,000 people - including livestock and entire food supplies - could have lived 18 storeys beneath the earth.
Thought to have been created during the Byzantine era in 780-1180AD, the network of kitchens, stables, churches, tombs, wells, communal rooms and schools was most likely used as a massive bunker to protect inhabitants from the Arab–Byzantine wars or natural disasters. During this time, cave-like chapels and Greek inscriptions were added to the ancient city, and about 600 entrances allowed people to come and go.
Lots of photos at link: http://www.dailymail.co.uk/news/article-4032200/Photos-underground-18-storey-city-Turkey-reveal-hidden-rooms-house-20-000-people.html#ixzz4SpZbkEfC