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.

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.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

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.

Structure built from the skulls of vanquished foes.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

The only Shinto shrine in Europe that has been officially sanctioned by Japan.

The Uyghur settlement in the middle of a lake continues to raise questions.

Volcanic irregularity? Odd erosion? Alien eggs? Local legends compete to explain these strange orbs.

Propped high atop the peak of Mount Gamsutlmeer, this abandoned village is one of the oldest settlements in the region.

This burial mound is said to be the final resting place of Russia's first Viking ruler, Oleg of Novogrod.

A tea party concludes each visit to this Russian spice cookie sanctum.

300-year-old villagers houses and traditional churches preserve a nearly lost piece of Russian history.

Russian researchers who have been excavating ancient squirrel burrows may have brought a 32,000-year-old plant back to life.

An abandoned 14th-century castle and prison complex on a small island in the Neva River.

One of the most well-preserved mammoth specimens in the world.

Five mile wide circular ring of rock in the Russian Far East is a curious geological oddity.

A uniquely authentic display of traditional Russian culture.