An inconspicuous footbridge beloved by San Diego locals.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

What is the Thing?

Recycling meets art in this colorful barricade.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Legends surround this jagged rock formation in the New Mexico desert.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A mysterious "wedding cake" castle in the middle of the urban desert.

One of the shortest streets in York has an especially odd name.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Follow the original medieval paths that wind through this intriguing section of the city.

A vortex fountain that seems to rise out of the ground.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

This gorgeous space is England's largest independent library outside of London.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

Huge winged monument in the United Kingdom.

An abandoned tower once used to study the cosmos hides within a thicket of greenery.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.