Grimes Point is one of the largest and most accessible petroglyph (rock art) sites in the United States. There are hundreds of boulders in this locality with petroglyphs inscribed in them. Designs include circles, wavy lines, human figures, snakes, and other animal figures. The rock art is believed to be about 6,000 years old. Visitors can view examples of petroglyphs along a short, self-guided interpretive trail. The site is managed by the Bureau of Land Management.