10: Denali National Park & Preserve, Alaska
The focal point of this park is Mount McKinley, the tallest mountain in North America. There are over 6 million acres of forests, tundra, rock, glaciers and on the mountains you can of course always find snow. It's quite the diverse environment which offers plenty of recreational activities in the winter including dog sledding, cross-country skiing and snowmachining. Kahiltna Glacier is another spectacular reason to see the park, no matter what season it is when you visit.
Address: George Parks Hwy, Denali National Park and Preserve, AK