Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

This Stockholm light tower can be controlled by anyone with a smartphone.

Abandoned for over a century, this chilling train tunnel is now a destination for ghost hunters.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

A museum dedicated to the history of psychiatric treatment featuring a gallery of art made by patients.

The flock of plastic poultry is an ode to the classic comedy staple.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

Once the nail factory shut its doors, this Swedish factory town was abandoned, leaving behind a modern ghost town.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

A curious collection dedicated to human and animal anatomy and pathology.

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

Abandoned Air Force base that has fallen into disrepair.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

It should come as no surprise that the world's largest artichoke lies in the town that calls itself the "Artichoke Center of the World."

An abandoned boat that's been stranded mysteriously for decades.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

An abandoned, unfinished mansion on grounds strewn with lava rocks.