An auroral research program that superheats the ionosphere.

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

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

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

The "Gateway to the Arctic" connects Barrow's indigenous population with the sea and its traditional industry: whaling.

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

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

One woman's dream became a train hotel in her backyard.

The ruins of this Alaska gold mine form a gorgeous ghost town.

Four-story concrete hotel never opened to customers.

Colorful boxes placed over the dead are left to rot and crumble.

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

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

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

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

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.

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

Massive mounds of golden sand look like a desert landscape randomly plopped in an Arctic forest.

The spot where the two men ate together now stands enclosed in glass.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

On top of a sheet metal business in Juneau stand nearly a dozen charming Wizard of Oz statues.