A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

More gold than anywhere else, ever.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Rippling sand dunes frozen in the Arizona rock.

Most-visited and most-photographed slot canyon in the American Southwest.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

These ancient giraffes are the largest known animal petroglyphs in the world.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

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

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.