The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

Two stunning 17th-century libraries and a cabinet of curiosities.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Real bones which are said to have belonged to a Polish dragon.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

One of the world's largest collections of medieval religious art.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

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

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

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

Ghosts of France's colonial past.

Too much gossip or just missing curfew could land you in here for a couple of days.

A unrivaled and rather horrifying collection of wax dermatological models.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

One of the last realized projects of an influential, self-taught, French Modernist architect Jacques Couëlle.