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

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

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

A museum dedicated to secret surveillance.

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

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

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

Ruins of an old water tower that look like a horror-film castle.

A well preserved medieval fortress in Vojvodina.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

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

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

A quirky little wax museum is home to some of the most famous Serbians in history.

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

This symbol of Yugoslav liberation decorated with 620 carved heads of mythical creatures is now a forlorn relic of another time.

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

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

A Museum with a collection of 40,000 matchboxes.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

Once a bridge over the River Begej, now high and dry.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

What started as a collection of vintage tractors turned into a museum filled with cars, radios, and other oddities.

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

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.