Secret Passages

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

Countless grotesque faces stare out from this eerie Prague art wall.

The beautiful baroque library of the Hapsburg empire.

The oldest building in Vancouver's Chinatown is now home to one of Canada’s largest contemporary art collections.

The ruins of a creative scholar's fantastical unfinished sanctuary act as his massive gravestone.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

An unassuming secret door once led to a legendary watering hole.

A subterranean Holocaust refuge within one of the world's longest cave systems.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

Vast network of air raid tunnels beneath Lombardy's capital.