Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The legendary building that needed ghostly approval before being built.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Dramatic river bend surrounds a natural red-rocked pedestal.

A bizarre house filled with an astounding array of collections.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

One person's lost luggage is another person's treasure.

A hand-built folk art installation covered with messages of God's love.

A toxic ghost town sitting atop a massive coal fire.

America's most famous piece of self-built architecture.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

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

Home to a vast and influential collection of Shakespeareana.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

One man's lifelong collection of 10,000 rare steins tells the story of beer drinking from 1350 to today.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.