Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

The history of radiation is on safe display at the foot of a radiation science laboratory.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Statue of death tucked in the University of Medicine courtyard.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

Paris' linguistic guide to the international language of, yes, love.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A massive, fading granite poem is all that remains of one Whitman superfan's tribute to the famous writer.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

This extensive nuclear fallout shelter built from 42 school buses could house 500 people in its tunnels.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

The roadway bend where highway painters practice their craft looks like expressionist art.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

This whimsical fountain pays tribute to Toronto's four-legged friends.