Gorgeous cave resemble a winter wonderland.

This whimsical stacked cabin looks like something out of a children's book.

The king of U.S. high points towers over every other peak on the continent.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A colorful architectural gem in Seattle's uniquely modern Central Library.

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

An exquisite tunnel of cascading flowers.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Roman ruins top white travertine terraces formed by ancient hot springs.

An enormous, inside-out glass globe built in 1935.

Breathtaking and huge 430 year old maps of Italy.

A one-of-a-kind collection of a unique medium.

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

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A psychedelic labyrinth on the San Francisco bay.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A kaleidoscopic warehouse-maze of handmade neon signs.

World's largest collection of serial killer artwork and other macabre exhibits.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

Light still pours into the ruins of this ancient Islamic observatory.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.