Red Rocks Amphitheatre is a rock structure near Morrison, Colorado, 10 miles west of Denver, where concerts are given in the open-air amphitheatre. Red Rocks Amphitheater is a naturally formed, world famous outdoor venue just fifteen miles west of Denver. There is a large, tilted, disc-shaped rock behind the stage, a huge vertical rock angled outwards from stage right, several large outcrops angled outwards from stage left and a seating area for up to 9,525 people in between.