What looks like a normal building is really a hollow facade hiding a subway vent.

A subterranean shelter remains intact under a busy Paris railway station.

Abandoned railway line circling the city of Paris.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

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

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

This Parisian café sticks almost exclusively to an ethos of reuse.

A French artist's vague warning hangs over Belleville.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A museum of carnival attractions where you are invited to ride the rides.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.