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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

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

Called the "Armenian Stonehenge," this ring of menhirs pierced with holes may be a prehistoric astronomical observatory.

Giant stone letters dedicated to the founder of Armenia's alphabet.

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.

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

A geological oddity topped with a 2,000-year-old pagan temple.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

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.

What happens when you cross a mayor and a painter?

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.