This hidden Art Nouveau courtyard is an opulent feast for the eyes.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This large, circular tomb is the final resting place of the first emperor of Rome.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

A lovingly curated curio shop in which the taxidermy wear newspaper party hats, and peanut shells are spread across every surface.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

Notorious artist squat renovated into legal studios.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

An unusual sand beach in the middle of a forest.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

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

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

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

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

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

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

This lesser-known Frank Gehry building houses a treasure trove of cinema history.