This fresco inside a Serbian cave church has been a source of disagreement.

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

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

Sealing couples' love since just after World War I.

This statue became the mascot of Vrnjačka Banja after Games Without Borders made a stop in this town.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

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

A striking symbol of the Bulgarian capital.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Annual street carnival celebrating Indonesian heritage.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

What happens when you cross a mayor and a painter?

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

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

The sad remains of a monument to martial arts legend and movie star Bruce Lee—in the middle of Balkans.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.