Land Features: Red Rocks Red Rocks open-air amphitheater is geologically formed from two 300-foot high sandstone formations that serve as its walls. On a makeshift stage, the first documented performance occurred in 1906 with regular performance seasons scheduled since 1947. Red Rocks is located west of Denver, Colorado.High Resolution Orthoimagery, 2-foot spatial resolution, Denver Dataset, April 2006. High Resolution Orthoimagery looks like a photograph but any distortions caused by the tilt of the camera or topography of the land have been removed, so orthoimages are geospatially accurate and can be used as maps.