Stalactites and stalagmites in a beautifully lit cave.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

An homage to the medieval rulers of Bulgaria.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

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

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.

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

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

A flamboyant five-story building in Bulgaria resembles a crawling snail.

"Unity, Creativity, Beauty."

This historic black and white monastery is one of Bulgaria's architectural jewels.