Derinkuyu is home to a massive underground city in Cappadocia, Turkey.

The Lost City of Derinkuyu was carved into volcanic rock by the Hittites around 1400 BC, expanded by the Phrygians in the 8th century BC, completely forgotten for centuries, and then discovered again by... some guy.

Here's the impossibly massive metropolis that dude stumbled upon:

THAT ROOM LED TO AN ENTIRE ANCIENT SUBTERRANEAN CITY. 0010 CRACKED.COM

THIS IS A WHOLE CITY, NOT JUST A BUNKER. SALIDAENTRADAT BALIDA CIunan SUSTERBANEA BE DERINKUTU IT'S 18 STORIES DEEP, AND CAN COMFORTABLY HOUSE 20, 000

IT WAS BASICALLY THE MALL OF AMERICA IN THE UPSIDE DOWN. Q21003D0 E-8 THEY HAD SHOPS, TOMBS, SCHOOLS, CHURCHES, WINE CELLARS, AND A LOT MORE. CRACKED.

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IT WAS DESIGNED TO PROTECT AGAINST RAIDERS: THE ENTRANCE SHAFT FORCES GROUPS INTO SINGLE-FILE. THE WELLS ARE NOT ACCESSIBLE FROM THE SURFACE. EACH LEV

ARCHAEOLOGISTS HAVE FOUND A 3-MILE LONG TUNNEL TO ANOTHER UNDERGROUND CITY.

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