Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

According to a gruesome legend, an architect sacrificed his wife to build this spectacular, 16th-century cathedral.

Something's watching you.

Locals believe this abandoned ruin on the outskirts of Bucharest is haunted.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

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

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

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

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

An old spa town in the mountains of Romania where, according to legend, the great hero Hercules once bathed.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

After immigrating to Paris in the 1970s, two brothers from Laos built a grocery store empire.

Dishes are packed with flavor at one of the only Singaporean restaurants in Paris.

Peruse produce from Senegal, Cameroon, and other West African nations at this sprawling market.

This oddly shaped boulder in Paris is rumored to be cursed.

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.