The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

In the early 1800s, surgery was also a show.

An abandoned water park overtaken by the dunes.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Even Henry David Thoreau found this glacial pothole irresistible.

This small town's local tradition is to create the world's tallest ice pillar.

These otherworldly caverns form Earth's oldest known cave system.

A toxic ghost town sitting atop a massive coal fire.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

It would take 35 firetrucks to fill this enormous glacial pothole.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

An abandoned asylum incorporated into a college campus.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This public space is speckled with the eerie remnants of a defunct amusement park.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.