Adak National Forest, a.k.a. The Christmas Tree Forest.
Made up of 33 evergreens, Adak National Forest began as a tree-planting project designed to improve soldier moral during WWII. Local residents placed a sign, which humorously reads Enter and Leaving the Adak National Forest, next to the grove some time in the early 1960s.
While the base was under military command, residents annually decorated the entire “forest” in Christmas tree lights. Today the base is closed, and Adak has become part of the National Parks System.