This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Large collection from the 3rd millennium BCE.

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

This fresco-covered medieval monastery hangs from the side of a steep cliff.

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

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

A 16th-century mosque rebuilt after wartime devastation.

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

A forgotten and crumbling Yugoslav monument to the victims of fascism.

A crumbling monument to a now locally-extinct sport in Bulgaria's oldest ski resort.

A decaying, yet still functioning, work of communist architecture.

Now a ruin, this grand resort was coveted by a communist autocrat and an eccentric Japanese golfer.

This apartment is a true time capsule of local life in Bulgaria during the Soviet regime.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

UNESCO-protected ancient burial ground.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.