Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

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

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

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

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

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

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

A Serbian church lit by chandeliers made of weapons.

A pair of connected skyscrapers form this symbolic gateway.

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

Legends of treasure and spirits flow from this this fairy tale-like oasis.

A historic cavernous cistern lies hidden behind a wall at San Marino’s stamp and coin museum.

This cypress grove is a unique site considering these trees are not native to the region.

The largest art park on the European continent.

This late-brutalist masterpiece everyone forgot about was originally created to get the proletariat jazzed about the arts.

One of the most popular attractions in the small resort town of Kabardinka.

One of the notorious Soviet leader Joseph Stalin's many summer retreats.

An abandoned mansion is now a haven for urban explorers.

Thousands of biblical and pagan images are carved into this small 12th-century church.

A solemn, monumental, kitschy palace of worship honoring victory in the Great Patriotic War.

Russia's own leaning tower was built on a tragic historical fable.

A magnificent, Disneyesque chateau built for 150 lucky kindergarteners.

A former military outpost of Ivan the Terrible, the 16th-century church contains some of the rarest examples of Eastern Orthodox mural paintings.

The laboratory where the Soviet secret police invented exotic poisons used to kill dissidents in hideous and (mostly) untraceable ways.