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The walk out to Pu’u Loa Petroglyphs takes 1.5 hours. The trail traverse lava flows to this extensive and well preserved petroglyph field. Petroglyph is an ancient Hawaiian art form that was often etched into stone and was used to communicate about events, reflect lifestyle, and mark boundaries and trails. The Big Island has the largest concentration of this ancient art form in the state and Hawaii Volcanoes National Park is the best place in the state to see them.