The sun sets behind the Wood River Mountains and Snake River within the Togiak National Wildlife Refuge, Alaska.

Denali (Mt. McKinley) from near Eielson Visitors Center along the Denali National Park road, Interior Alaska; Alaska, United States of America

Woman backpacker hikes along Upper Fuller Lake in the Kenai National Wildlife Refuge on the Kenai Peninsula in South-central Alaska

Woman backpacker hikes along Upper Fuller Lake in the Kenai National Wildlife Refuge on the Kenai Peninsula in South-central Alaska

Woman backpacker hikes along Upper Fuller Lake in the Kenai National Wildlife Refuge on the Kenai Peninsula in South-central Alaska

Fields of Fireweed on a summer day in Coldfoot, Alaska

Aerial view of the Brooks Range in summer, ANWR, Arctic Alaska

Visitor Center At Tetlin National Wildlife Refuge, Alaska