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

Arrr! The most authentic collection of pirate artifacts in the world... matey.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A private collection of massive steel monsters guarding a Texas pipe works.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A tiny, unassuming park in Tampa that belongs to the Republic of Cuba.

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

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A self-built castle made by a mysterious man.

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

A museum dedicated to the history and exploration of both popular music and science fiction.

A rare view of a preserved Victorian science museum.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

World's first "penitentiary," meant to be humane, drove men insane.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

While these wooden totems bear a striking resemblance to First Nations artwork of British Columbia, their actual origins lay on the opposite side of the Pacific Ocean.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

These strikingly barren, rolling red hills were caused by bad farming practices.

This natural sea cave hides a small wonderland of natural turquoise beauty.

Lost subway station nestled beneath Toronto's busy commuter line.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

An ancient Viking village in North America that predates Columbus by 500 years.

Historic psychiatric asylum and most-filmed location in the Great White North.