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.

A museum dedicated to the history and art of staying clean.

A smoke stack so large, the Washington Monument could fit inside!

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

This rustic old building is said to be the most photographed barn in America.

The easternmost town in Alaska can only be accessed from Canada.

Roadside collection of 65,000 signs.

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

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

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

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

This tiny square mile of Canadian sand was once considered the world's smallest desert.

This decommissioned DC-3 now forever points into the oncoming wind.

A famed drink seasoned with an amputated toe, now on its tenth digit.

A lasting testament to the Klondike Gold Rush.

The northernmost international land border crossing in the United States.

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

The oldest original lighthouse in Alaska that was born out of a tragic shipwreck.

Known as the “Official Greeter of Juneau,” this dog still welcomes ships and their passengers to Alaska.