Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Three columns of volcanic rock shoot out of the ocean.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

This mouldering abandoned mental hospital was once a center for progressive healing.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This enormous abandoned factory is now a makeshift graffiti gallery.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The fifth-longest natural arch in the world, and the longest outside China.

Most-visited and most-photographed slot canyon in the American Southwest.

A sharp bend in a dramatic river canyon cut through red rocks.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This geothermal hot spring hides beneath a slowly growing mineral dome.

The location along the shores of the Great Salt Lake of what was once called, "The Coney Island of the West", now sits barren due to arson and time.

A historic lighthouse steeped in rumors of ghost and pirate stories.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

A long abandoned hospital building on the outskirts of NYC.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

A natural gas leak provides a flickering flame beneath a waterfall.

The third version of this tall sailing ship sits, rusted and burnt, in Lake Ontario.

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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."