This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The oldest stone house in Paris was built by its most famous alchemist.

Where once there was a train station bathroom, there is now this German burger joint.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A museum dedicated to a Cold War era sausage.

A fascinating insight into daily life in the Eastern Bloc.