One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

This lurid German fountain plots the sad course of marriage from dating to death.

Go surfing on this urban wave, "hacked" by local surfers.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

An eatery for UFO seekers on the Extraterrestrial Highway.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

"There's nothing there," and other lies the KGB told us.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

A son-and-daughter meat market, hawked by mom and dad.

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

Ancient burial grounds of the wealthy.

This Stockholm light tower can be controlled by anyone with a smartphone.

A former suicide bridge is now accumulating symbols of love instead of a body count.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

The library's graceful rotunda is like a bibliophile's temple.

Sweden's "good old days" painstakingly re-created in a model village.

Sweden's oldest animated sign is still lighting up the skyline today.

Stockholm's deepest subway station is also a stunning ecological wonder.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.