petroglyphs in piedras marcadas canyon, petroglyph national monument, albuquerque, nm.

petroglyphs piedras marcadas canyon petroglyph national monument albuquerque nmlyph stone carving writing precolumbian ancient rocks boulders basalt volcanic parks new mexico tourism history historic archaeology anthropology indian pueblo native american aboriginal trails hiking sightseeing travel unique art expression communication cryptic mysterious mystery some four hundred part mexicos