Red Rocks' famous hidden tunnel

A hidden tunnel underneath Red Rocks Amphitheatre is covered with signatures from some of music's biggest names, spanning from beneath the stage to the ampitheater's sound engineering area.





http://blogs.westword.com/backbeat/2012 ... atures.php

I got to take a tour back there and it is pretty cool. The dressing rooms have actual rock walls and you can sit or lay down on actual rock formations when you are are in them.