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

Sofia's legislative center is continuously reinventing itself.

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

The ridged layers that make up this river canyon represent Earth's geological history.

This 15th-century Serbian Orthodox monastery also contained a school for illuminating manuscripts.

A little theme park full of miniature monasteries and churches, made by hand.

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

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

A Hollywood-sign replica with a typo on a remote hillside.

A sculpture of a blood drop designed to honor those that have donated the precious liquid.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

Curious carved stones and bird-like wings are a symbol of Serbian resilience and freedom on the site of a WWII massacre.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Oriental bazaar in the heart of Sarajevo.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

Sealing couples' love since just after World War I.

The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

Bridge that died in war and was resurected.