In this historic region, homes and churches are carved into ancient volcanic rock formations.

The largest hewn stone in history.

Mysterious lost empire of the Silk Road.

This one-time health resort was used by aristocrats around the world.

The Habsburgs' royal collections of art and wonders.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

An autonomous republic of Orthodox monks.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Where commuters walk through remnants of an ancient Greek necropolis.

Large collection from the 3rd millennium BCE.

A spectacular cave and a beguiling lake.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

Romania's triumphal arch looks out over Bucharest.

What happens when you cross a mayor and a painter?

Longest fortress system anywhere in Europe.

An ancient knight and a symbol of the city's freedom.

Bridge that died in war and was resurected.

A tiny church on a man-made island in the Adriatic.

Oriental bazaar in the heart of Sarajevo.

The place where World War I began.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.