This artificial ring island was built to hold cubic tons of polluted dirt.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Because sometimes the most efficient route from A to B isn't a straight line.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

The most metal church of all time was built in record time because of an international, pious pissing contest.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

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

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

This abandoned airplane hanger is said to have once been a top secret launch facility.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

This crescent-shaped sliver of sand is a magical haven for a herd of feral horses.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A two-inch thick solid brass rod that extends an astounding one kilometer straight into the earth.

The world's largest drain sits below the city of Kasukabe, Japan.

Two distorted Romanesque columns hold aloft a mine cart in honor of laborers who died during WWII.