This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This former prison is an Art Deco masterpiece with a past full of civil rights flashpoints.

World's largest magnetic research facility.

A trove of tiny treasures hidden within a Florida park.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

Off of the Crawfordville Highway in Florida, nature is taking back this decrepit row of Ford trucks.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

This creative sculpture was a way to "recycle" an old tree.

This historic crypt was said to have been designed and built by the very person who is buried inside of it.

This historic headstone is said to mark the final resting place of a doubly-dead white witch.

One of only two pod-shaped homes designed by Frank Lloyd Wright.

The haunting remains of a failed housing development can still be found behind the big box stores that were to anchor them.

One man's grief over the national tragedy has manifested in a pod of homemade whales on his front lawn.

This sidewalk monument honors more than 50 civil rights activists who helped change the face of America.

This fairytale-inspired cottage was created by a university literature professor.