This abandoned mine offers a glimpse at what life was like for those who came to Alaska seeking Gold Rush riches.

This junkyard made over as a theme park is the "Most Alaskan place in Alaska."

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

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

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

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.

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

This abandoned prison castle has become an imposing gallery of graffiti art.

An abandoned concrete jungle surrounded by a lush park.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

Double spiral staircases are not unheard of, but they are very rare.

An ingenious solution to a tricky engineering problem, this spiraling bridge takes drivers for a dizzying spin.

The ancient tomb acts as a calendar that keeps perfect time.

A portal into the bricked up canal that runs through the heart of Washington D.C.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

The quiet canyon has a tumultuous history involving a doomsday cult.

What began with a single, 357-pound chunk of the Canyon Diablo meteorite grew to be an impressive collection. 

The hotel room where Janis Joplin tragically died has now become a makeshift shrine to the singer.

This traditional garden in the San Fernando Valley doubled for Star Fleet Academy, and is irrigated entirely by wastewater.