Red Rocks Amphitheater is a stunning, naturally formed amphitheater located in the Rocky Mountains. The first ever natural amphitheater in the world, it is geologically formed, made up of two, three hundred foot (91.44 meters) monoliths. The Red Rocks area is known as the Garden of Angels and is world-famous for its perfect acoustic pitch. Red Rocks has been the venue for entertainers since the turn of the century and has a plethora of musicians and artists performing every month. Even if there isn't a concert playing, there's always the majestic splendor of the 640-acre (259 hectares) park that surrounds the venue.