Massive underground city discovered in Turkey may have housed 20,000 people or more

Brett Smith for redOrbit.com – Your Universe Online In 2013, workers in Turkey looking to demolish low-income housing near a Byzantine-era hilltop castle stumbled upon something extraordinary: an expansive underground city that may have housed 20,000 people or more. We think they actually found a huge Diglett sanctuary. Located in the middle of the country near…