Legend says train robbers stashed their gold within the depths of this unusual cave.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

A Tucson museum and performance space full of found-object movable sculptures.

A natural history wunderkammer in the middle of the desert.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

The world's largest military aircraft cemetery.

Miniature art that tells an enormous story.

The fading, forgotten remains of a once bright and booming factory.

The Magical World of George Phar Legler.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

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

Research missiles and rainbow auroras at the world's largest land-based rocket range.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

A giant poultry statue immortalizes one of Alaska's more humorous town names.

Don't be a grizzly man. Get personal with Alaska's wild bears from the safety of this conservationist camp.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

Low tide reveals 8,000-year-old rock carvings in Southern Alaska.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

Internationally recognized group that works to protect the wolf and educate the public about its plight.

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

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

A rare kind of blue bear can be found chiefly in the national park that shares their name.