The northernmost international land border crossing in the United States.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

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

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

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.

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

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

Celebrating the history of whiskey production during New Zealand's era of prohibition.

Taumatawhakatangihangakoauauo tamateaturipukakapikimaungahoronuku pokaiwhenuakitanatahu.

This unusual rock formation looks like an apple that has been neatly sliced in half.

One of the world's steepest streets seems to have houses sliding down it.

The most southerly spot on New Zealand's South Island is home to surreally shaped, permanently mangled trees.

One of the world's largest Tesla coils.

Some of the clearest water anywhere in the world.

Known for the tunnel that leads visitors to the water.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

The only surviving prototype of Buckminster Fuller's revolutionary car.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

A new kind of theme park for adults off the Las Vegas Strip.

A picture-perfect town, perfect for blowing up.