An isolated "phantom bridge" doomed to crumble into ruin.

A stunning architectural yet functional feat, towering over Oslo.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

A replica of a beloved, delicately-balanced granite boulder.

When in Idaho, sleep in a giant potato.

An abandoned desert hamlet swallowed up by sand.

At this deceptively beautiful beach, nothing is what it seems.

This steel frame is a skeletal mirage of a lost 16th-century stone building.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

Four-story slides send people whizzing through the math department at this Munich university.

No one is sure why this mysterious tradition started.

A fantastical and futuristic temple of light built from nine monumental glass veils.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

This banal Parisian entranceway is not what it seems.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A tomb in the shape of a traditional Mexican hat and shawl for the father of modern rancheras.

This graceful little figure is a one-of-a-kind version of the cherished character.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'