A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A spherical "micro-nation" in the heart of Vienna.

Op-art architecture designed for happiness.

Baroque celebration of the end of the Great Plague of Vienna.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The once highest point in China blends symbolic design with a kick of adrenaline.

The magic's in the hole!

A treehouse assailed by the elements and the government, now gone.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

The most famous location in China was home to whole dynasties worth of imperial rulers.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Oldest Protestant church in the Middle East, designed to resemble a synagogue.

A "miracle" that seems to produce more holy fistfights than holy revelations.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

60 feet of towering steel balances gracefully.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A second generation sun-powered marvel lights up the night.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.