This ancient theater was once the home of fierce gladiatorial battles.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A whimsical bridge adorned with decorative dragons.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Structure built from the skulls of vanquished foes.

See how paper is made the old-fashioned way.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A 11-foot former president stands on a Kosovo street that also bears his name.

A futuristic, brutalist masterpiece that is also strangely prison-like.

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

An apparition of Virgin Mary in Herzegovina.

Bridge that died in war and was resurected.

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

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

The first mosque in the world to receive electricity.

The place where World War I began.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.