The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Most-visited and most-photographed slot canyon in the American Southwest.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

It houses the remains of a 17th-century version of the Titanic.

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

Norway's oldest cathedral still in use.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Walk behind a 50-meter-high waterfall.

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

Climb to the top of the world's largest seated bronze Buddha.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

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

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Ruins of a German castle on top of a towering stone pillar.

When the rain falls, this drain system turns into a musical instrument.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Cold war icon and onetime "hole" in the iron curtain.

The most visited, and possibly most controversial, museum in Germany.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.