Sunset at Iriquois National Wildlife Refuge. Sunset at Iriquois National Wildlife Refuge (Thompson, Dorothy/USFWS)

Wildfire Smoke Colors Sun Near Tetlin Refuge. This view was taken from the Tetlin Refuge Jatahmand Lake Admin Cabin. Smoke from the 2004 wildfire colors the sun. This fire was not on Tetlin NWR land. Digital image only. (Jerry, Danielle/USFWS)

Sunset in Sabino Canyon. Sunset in Sabino Canyon (Stolz, Gary M./USFWS)

Adak sunset from Kuluk Beach. September 1981 (Logan, J/USFWS)

WO1866 Sunset at Iroquois NWR. WO1866 Sunset at Iroquois NWR (Thompson, Dorothy F./USFWS)