A Roman monument to their own civil engineering prowess.

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

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

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

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

The ridged layers that make up this river canyon represent Earth's geological history.

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

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

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

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A Serbian church lit by chandeliers made of weapons.

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

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 16th-century horror show built in a lovely Italian garden.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

The sunken structure looks like the victim of a catastrophic flood.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Started as a kitchen garden, now the second largest botanical garden in the world.

A surreal museum of extraordinary industrial objects.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.