A historic scientific breakthrough that crosses nine borders.

A wooden replica of France's famous tower.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

Two well-hidden huts let animal lovers spend the night among the bears, wolves, and other predators of the forest.

Legend says lovers who hold hands while venturing along this stone jetty and kiss at the end will remain together forever.

Man-made mineral caves house massive bat colony.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

This natural spa is known for its healing properties and vibrant hue.

This natural monument has an origin story steeped in legend.

A hidden stream deep in the mountains creates one of the largest tufa waterfalls in Serbia.

These natural stone bridges are the largest on the European continent.

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

The oldest church in Serbia was also the ecclesiastical seat of the region during the Middle Ages.

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

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

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

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

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

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

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

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

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

Gigantic Romanian salt mines used to heal respiratory conditions.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.