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.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

From the Difference Engine to the Cray-1, all under one roof.

A classically inspired temple in Redwood City.

A man-made island in scenic San Francisco Bay.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

An essential stop before plundering, BYO Cutlass.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Furniture tries to escape an abandoned building in San Francisco.