"A #Turkish homeowner chasing his chickens through a hole in his basement during renovations came across an abandoned underground Turkish city that once housed 20,000 people.

In an effort to recapture his escaping poultry, the man knocked down the wall in the #1960s to reveal a dark tunnel leading to the ancient city of Elengubu, known today as Derinkuyu.

Derinkuyu, burrowed more than 280 feet beneath the Central Anatolian region of Cappadocia, is the largest excavated underground city in the world and has 18 levels of tunnels containing dwellings, dry food storage, cattle stables, schools, wineries, and even a chapel.

The exact date the impressive city was built remains contested, but ancient writings dating back to 370 BC indicate Derinkuyu was in existence."