Man knocks down basement wall and discovers vast underground city

On the list of surprising things to find in your basement, a vast underground city dating back centuries is probably high on the list.
But that’s exactly what one man discovered in 1963 after taking a sledgehammer to the wall of his cellar in Nevşehir Province in Turkey.
The man – who has stayed anonymous in subsequent reports – found a tunnel lurking behind the wall during a bit of home renovation.
The tunnel led to another one, and then another behind that.
He had unwittingly located the entrance to a huge underground city called Derinkuyu.
The subterranean warren had been abandoned for centuries and was eventually found to be 18 stories deep and capable of housing up to 20,000 residents.
Man knocks down basement wall and discovers vast underground city