Within 15 miles of Denver, you can experience a majestic open-air amphitheater crafted by Mother Nature. Red Rocks has hosted everyone from the Beatles to opera stars to U2. It is the only naturally occurring acoustically perfect amphitheatre on the planet. As one of the most beautiful outdoor performance venues in Colorado, Red Rocks Amphitheatre opened to the public in 1941 with a capacity of 9,525 seats and has since been a popular destination for concert-goers, sight-seers, and exercise enthusiasts. As can be seen in the following photos, this stunning amphitheatre is truly a one-of-a-kind venue.