Medicinal spa created with the discharge from a geothermal energy plant.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This historic mansion was built as a symbol of love between a husband and wife.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

The greatest real estate coup of all time.

Elevated freight railway turned wildly successful urban park.

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

The last of its kind in the country.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

A stealthy Apache hideaway that became the haunting site of a mass grave.

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

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.