Before the Great War, National Park HQ was a large building used as the administration offices for Acadia National Park. By 2287, it had become a hideout for several super mutants, former members of the group that inhabits the Vim! Pop factory.
The site consists of a two-story building, a large V-shaped barn, and a central parking lot. There is a steamer trunk just inside the barn's east entrance. The house itself contains an Advanced-locked safe behind the front counter and numerous meat bags, but little else of note. Entering the barn will trigger the arrival of a super mutant suicider and another super mutant.
Several hundred yards west of the site at the northern end of a short north-south path are three ruined houses inhabited by feral ghouls. One of the houses is equipped with a mattress inside and a cooking station on the front porch. The house with the mattress also has an Expert-locked floor safe under the trash can in the kitchen.