The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A museum dedicated to the history and exploration of both popular music and science fiction.

Elevated freight railway turned wildly successful urban park.

Stroll through a wonderland of stupendous moss-covered trees.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This mesmerizing, colorful structure looks like a tent made from stained glass.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Large Hadron Collider and the Birthplace of World Wide Web.

Walk through a restaurant's refrigerator door to reach this hidden bar.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

Monasteries on rock pillars, once accessible only by frayed ropes.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Concentrated around the Dead Sea, these surprising canyons are filled with coursing water, fish, and even crabs.

Underwater restaurant at the coral reefs of Eilat.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A refurbished locomotive from a bygone era in the middle of the Jordanian desert.

Located near Cairo's El Korba district, the abandoned mansion continues to inspire mystery and rumor throughout the city.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.