18300 W. Alameda Pkwy., Golden
This natural amphitheater is surrounded by dramatic red rocks that, in addition to being stunningly beautiful, reflect sound back onto the stage, giving it the best acoustics of any outdoor arena in the states. Red Rocks is famously a bucket list venue for many performers, so the lineup is a little of everything—everyone from The Beatles to Daft Punk to the Grateful Dead—and, for a few nights in the summer, the Colorado Symphony—has played the stage. Arrive early so you can tailgate in the parking lot and admire the sunset, then head into the venue where you'll be able to see every single star above the performers' lights. If you can't catch a concert, it's worth stopping by during the day to admire the rocks—you'll find plenty of locals here around sunrise running the stairs.