Derinkuyu- the ancient underground city was discovered beneath a house in 1963

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In 1963, a man in the Nevşehir Province of Turkey knocked down a wall of his home, and behind it, he discovered a mysterious room. This room led to a tunnel which led to an incredible discovery: the ancient underground city of Derinkuyu. This underground city is neither the largest nor oldest, but its 18 stories make it the deepest. Extending to a depth of approximately 60 m (200 feet), it is large enough to have sheltered approximately 20,000 people together with their livestock and food stores.

It was most likely used as a giant bunker to protect its inhabitants from either war or natural disaster and could be closed from the inside with large stone doors and each floor could be closed off separately. The elaborate subterranean network included discrete entrances, ventilation shafts, wells, and connecting passageways. It remained hidden for centuries.

Full story : http://www.thevintagenews.com/2016/07/05/ancient-underground-city-discovered-beneath-a-house-in-anatolia-turkey-2/