The scuba diving training facility was named for the steam that rises from the cave's chimney.

This kitschy curio wonderland is full of fake animals, teak tables, and a cacophony of random bric-a-brac.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

Ruins of a Carnegie family mansion on Cumberland Island.

Only through the lens of a microscope can visitors see the true treasures inside this museum.

A natural wonder with mythological ties to the local Ainu tradition.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

One man's lifetime collection of tiny objects of wisdom gathered from around the world, on display for public enjoyment.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

The once abandoned ruins of a Victorian beachside amusement park are now back in working order.

The intriguing personal collection of a professional demon-chaser.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

This stunning Connecticut mansion is actually just a one-room-deep hoax.

An abandoned gun-funded 19th century utopia.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

A small flooded ghost town with a few scattered structures remaining.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

A replica that won't float away.

Largest collection of mounted dinosaur specimens in the world.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.