There is a mostly forgotten world under most cities. Some are...

There is a mostly forgotten world under most cities. Some are buried now, others are crumbling and will be lost. But there are others, like these tunnels under New York that will remain for centuries to come. 

I’ve been researching this underground world for one of my novels. It’s Post-Apocalyptic, of course, and the survivors take refuge in the tunnels underneath New York City. 

I think the irony is striking when you consider this… If there is an apocalyptic event, humans will be forced to flee to places like the one pictured above, directly underneath the greatest engineering feats of our time. The skyscraper you live or work in may have been built overtop of what becomes your refuge.