A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

An underground city of salt.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Island wonderland for communist autocrats.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Once one of the most beautiful buildings in Serbia, this palace stands abandoned in a park.

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

This spa park features an open-air museum of abstract marble sculptures.

Backwards hour and minute hands and a timing mechanism that fluctuates with the temperature led to this clock tower's local nickname.

This beautiful medieval Serbian monastery is home to frescoes, peculiar sculptures, and historical curiosities.

Sealing couples' love since just after World War I.

At this archaeological site, visitors can explore the ruins of the capital of the former Roman province of Moesia.

After this medieval Serbian fresco was hidden for centuries, an image of it became one of the first to be sent into space.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

Near Belgrade, an ancient-looking sarcophagus serves as a World War I monument.

Stone age urban planning.

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

A Roman monument to their own civil engineering prowess.

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

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.