Petroglyphs, from the Greek words petros meaning stone and glyphein meaning to carve, are man-made carvings on rock or stone. Petrogyphs are found around the world and, more often than not, were made by prehistoric peoples. The petroglyphs in North American were made by the ancestors of Native American tribes and some are only a few hundred years old. While petroglyphs were made by different people at different times and in different places archaeologists believe that all rock carvings held a special meaning for the cultures that made them. Some petroglyphs appear to tell a story or mark a trail. Others were likely made for religious ceremonies or to record events.