It's said this geological anomaly was caused when the Devil took a bite out of the Irish mountainside.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

This World War II relic let Allied pilots know they were entering neutral airspace.

A trading post in the North Pole where children send letters.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

Gorgeous cave resemble a winter wonderland.

The ghostly remains of what was once the world's richest copper mine.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

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

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

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

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.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

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

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

A historic freight system that found the true gold rush is in tourism.

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

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

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

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

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.