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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. With signatures from lighting technicians who've toured with Tori Amos to a recent stencil by Grammy winner Bon Iver, viewing and signing the tunnel is an exclusive opportunity. Unless you're performing at Red Rocks -- or helping load-in the production -- chances are you'll never set eyes on the tunnel. If you do happen to make it back there, explore the walls and we're sure you'll find at least one of your favorite signatures. Page down to get a gander.

The scene from near the stage at Red Rocks during John Mayer's September 2010 concert.

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