Cities are be defined by their skylines, the buildings and structures visible from the ground up. But that’s just the tip of the ice berg for many metros around the world: there’s a whole host of subterranean infrastructure that supports second cities below the surface.
Sure, we’ve all heard of the Catacombs of Paris (and its creepy, creepy crypts), but everywhere from Leavenworth, Kansas to Kaymakli, Turkey have hidden underworlds.
We’ve descended into the world of secret cities and rounded up some of the most fascinating examples across the globe Read more