One of the world's oldest olive trees, thought to be over 2,000 years old.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A naturally beautiful, seemingly bottomless deep blue spring.

A subterranean Holocaust refuge within one of the world's longest cave systems.

Remains of a station that only operated for one year.

A monument to Lenin has been transformed into a statue of everyone's favorite black-helmeted, fool-choking Sith Lord.

The largest catacomb system in the world.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

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

A Serbian church lit by chandeliers made of weapons.

A misnamed well, with a deep dark past.

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

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

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

A museum dedicated to the former country.

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

Structure built from the skulls of vanquished foes.

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

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This massive underground salt mine now holds a sci-fi theme park in its depths.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

The Natural History Museum that time forgot.