This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

This Pringle-shaped ledge makes for the perfect photo op.

The overgrown ruins of a once thriving World War I-era copper mine.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

A tunnel of hardened lava along Maui’s famous Road to Hana.

A Hawaiian stairway to heaven—that you can't climb.

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.

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

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

Research missiles and rainbow auroras at the world's largest land-based rocket range.

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

Four-story concrete hotel never opened to customers.

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

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

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

Don't be a grizzly man. Get personal with Alaska's wild bears from the safety of this conservationist camp.

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

Gorgeous cave resemble a winter wonderland.

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

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

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