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You'll ask a range. It's the continent's last great wilderness.

Stretch is all the way from the Canadian border into the heart of the northern interior.

comprised of dozens of smaller subrages, the string of ice cover mountains runs for 650 miles

and is home to some of the most intimidating peaks in the world.

The Nali, Mount Foraker, Mount Hunner, it's an endless maze of glaciers, peaks, tundra, and brush.

In 1996, photographer John Birchin and his close friends Kevin Armstrong, Jeff Arvinders, and Doug Woody hatched an incredible plan.

They would walk the entire range from the small town of talk all the way to Lake Clark, 700 miles to the southwest.

They would cross only two roads.

In mileage, it's about the equivalent of walking from Los Angeles to the Oregon border maybe, or from New York to Chicago.

There are no trails. This region is plagued by chronically bad weather in mosquitoes.

This is no walk in the park, and it had never been done.

They spent their winter in spring planning and organizing.

In that summer, they quit their jobs in Denali National Park, established a series of caches, and started walking.

Here's John, or as his friends call him, Birchin.

We're trying to find the line at least resistant and be close to the mountains as we can.

Going over passes, following glaciers, just skirting the whole range, following the spine, but without being on the spine.

The thing is, there's just two different styles.

Fast and lighter, we call it slow and dumb.

We just want to be out there.

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