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

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

A quirky roadside sign was the subject of a years-long legal standoff over highway right-of-way clearances. 

Pay homage to a preeminent matriarch, and the native Dena’ina people, at this sculpture installation in Anchorage.

A copy of the famous bus used during the filming of 'Into the Wild' is on display at an Alaska brewery.

Siberian husky that delivered a life-saving antitoxin.

Four-story concrete hotel never opened to customers.

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

A morbid gateway to an Alaska town prides itself on the hunting history it represents.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.

This mile marker stands at the unofficial end of a highway built to defend the United States from a Japanese invasion during World War II.

Once the center of Gold Rush mania, now the starting point for the Yukon Quest sled dog race.

The sculpture's largest spire points directly toward the North Star.

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.

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

The now-serene site of the largest earthquake ever recorded in North America.

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

This picturesque cottage was the site of Ulysses S. Grant’s final and perhaps most important campaign.

An elegant German-style resort overlooking the Potomoc River.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

A Gilded Age hotel turned eclectic museum of Tiffany glass and curiosities

The homestead of American patriot John Adams.

An 18th-century Spanish watchtower made entirely of seashell and concrete.