The solemn exterior conceals an opulent interior of this 17th century church.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The first modernist church in Europe.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

A gift from Emperor Franz Joseph I to his wife.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A set of outdoor stairs named in honor of a famous Austrian artist.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This strange statue features a bust of the famous composer plopped atop a woman's body.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Hundreds of intricately carved Armenian stone crosses can be found within this huge cemetery.