This dazzling Art Nouveau mansion is now home to the Modern Art Gallery Subotica.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

Controversial site of what could be Europe's first pyramid.

Popular river that runs through the remote Serbian municipality of Leskovac.

Two distorted Romanesque columns hold aloft a mine cart in honor of laborers who died during WWII.

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

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

A wellspring of natural Viagra found in Bosnia.

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

Structure built from the skulls of vanquished foes.

This natural monument has an origin story steeped in legend.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Beautifully carved tombstones fill this unmarked graveyard, uniquely situated near the village's famous stone wine cellars.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

The romantic botanic tunnel feels like a well-kept secret.

A Roman monument to their own civil engineering prowess.

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

Curious carved stones and bird-like wings are a symbol of Serbian resilience and freedom on the site of a WWII massacre.

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

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

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

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.