At the Swelter Shelter site, you can explore a large number of different petroglyphs (carvings) and pictograms (paintings) on the surrounding rock walls. The hike to the site is just a 400 feet roundtrip from Cub Creek Road. The rock art was created by the ancestral indigenous people of the region, but the Swelter Shelter has been used by older cultures dating to as early as 7000 BCE.