Stonehenge was Built to Amplify Sound During Ancient Rituals

A new study by acoustics engineers at the University of Salford suggests that the ancient pagan religious site of Stonehenge may have been designed to amplify sound in very specific ways. 

Constructing a 1:12 scale model of the site, with missing stones also represented, the engineers tested the sound properties of the structure they called "Minihenge." Speakers and microphones were placed in and around it, and then ultrasonic sounds 12 times their normal frequency were used to account for the difference in scale.