Epidaurus Amphitheatre 3

he theater is marveled for its exceptional acoustics, which permit almost perfect intelligibility of unamplified spoken word from the proscenium or skene to all 15,000 spectators, regardless of their seating (see Ref., in Greek). Famously, tour guides have their groups scattered in the stands and show them how they can easily hear the sound of a match struck at center-stage. A 2007 study by Nico F. Declercq and Cindy Dekeyser of the Georgia Institute of Technology indicates that the astonishing acoustic properties are the result of a fortuitous accident: The rows of limestone seats filter out low-frequency sounds, such as the murmur of the crowd, and amplify/reflect high-frequency sounds from the stage.