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

Stone age urban planning.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

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.

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

Operating continuously since 1903, this "milestone" facility transformed the regional economy.

Structure built from the skulls of vanquished foes.

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

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

Sealing couples' love since just after World War I.