This demon atop the Notre-Dame de Paris looks utterly bored.

Inside a former cabaret, seven floors of erotic art.

This bridge was constructed from the rubble of the infamous Bastille.

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

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Olfactory delights in San Francisco's Botanical Gardens.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

World's smallest skyscraper, the product of a remarkable con.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

This failed condo development was reborn as a street art hub.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

Official museum, hall of fame, and repository of the Texas Rangers.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

This downtown Dallas art installation is always on the lookout.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.