A little known Colombian theme park of giant curiosities.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

Along this wire fence, travelers have been leaving a particular memento since 2012.

A lonely beacon, precariously perched atop a remote sliver of rock.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

A modern Nordic Pompeii on the Icelandic island of Heimaey.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Starship-temple contains 400 tons of drinking water and offers free Japanese lessons.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

No one really knows how these old hobby horses got here, but the herd keeps growing.

The steepest classic funicular in the world glides along a dizzying incline.

This conical hill was built as a testing ground for an engineer known as the Glider King.

This spectacular track has run continuously since 1882.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

A rare pod of derelict midcentury Futuro and Venturo houses lines a semi-abandoned beachfront resort outside Taipei.