This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

The social hall of this former factory is a Communist-era time capsule.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

An homage to the medieval rulers of Bulgaria.

A decaying, yet still functioning, work of communist architecture.

Sofia's legislative center is continuously reinventing itself.

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

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

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A striking symbol of the Bulgarian capital.

Site of one of World War I's most horrific scenes.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

A swath of France so devastated by war it is still forbidden to go there.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

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

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

Gigantic water vessel, permanently grounded in Southern Albania.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.