The northernmost international land border crossing in the United States.

Alaska Natives have lived on this tiny isolated island in the Bering Strait for over 5,000 years.

At 238 feet above the bottom of a gorge this span is known as the biggest thrill on the road to McCarthy.

An auroral research program that superheats the ionosphere.

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

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

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

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

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

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

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

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

Four-story concrete hotel never opened to customers.

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.

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.

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

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.