This medieval church is the only one in the world that features all Marc Chagall stained-glass windows.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Eighty million natural history specimens call this gargantuan museum home.

A cluttered and astounding collection of antiquities and curiosities.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

A fake medieval village in the middle of Turin.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Monasteries on rock pillars, once accessible only by frayed ropes.

The celebrated eyesore created by starry-eyed sweethearts.

Former hunting lodge of a duke who was an avid collector of impressionist works.

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

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

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

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

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

Sofia's legislative center is continuously reinventing itself.

An homage to the medieval rulers of Bulgaria.

A vast Communist-era exhibition space in the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.