ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by Stephen Alvarez @salvarezphoto | This complex rock art panel on the San Rafael Swell, in Utah, has engravings that span thousands of years—from the archaic era to modern times. The site sits on a conspicuous rock overlooking the junction of a major creek with its tributary. The images are incredible. There is also considerable evidence of vandalism, as someone tried to take some of the engravings off the rock wall with a chisel. One of the reasons I started the nonprofit @ancientartarchive is to digitally preserve and share sites like this. Follow me @salvarezphoto and the @ancientartarchive for more.」1月23日 0時38分