National Parks Showdown Slideshow

National Parks Showdown Slideshow

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This land of superlatives—that's Alaska, America's last frontier—is home to North America's tallest peak, 20,320-foot Mount McKinley (called "Denali" by local natives), as well as most of the continent's megafauna—moose, caribou, wolves, Dall sheep and, of course, huge grizzlies that gorge themselves in the salmon-rich, glacier-fed rivers.