Acoustic Perfection - Amphitheater at Epidaurus

Twenty-five hundred years ago, ancient Greeks built an arena which still produces stunning, unamplified sound. If, for example, a matchstick is dropped in the center of the original stage, people sitting in the top row (fifty-five tiers high) can hear it. (Move the video clip forward to 4:45 to watch the relevant segment.)

Credits

From Seven Wonders of Ancient Greece, broadcast by the Discovery Channel.