Alaska is a state in the far northwest. Very remote wilderness, often only reachable by plane. A large part lies above the Arctic Circle. Abundant wildlife.
Denali is the best known national park in Alaska, with America's highest mountain, Mount McKinley, 20,300 feet. Good place for backcountry hiking (no trails).
Backcountry hiking is also the way to explore the other great parks, like Glacier Bay and Gates of the Arctic. The Tongass National Forest and Chugach Sate Park offer hiking trails.