Stonehenge may have been built for acoustics
2 Cave Paintings and Spirit Noises
Cave paintings in France depicting herds of animals like bulls and horses have until recently been thought to depict Paleolithic hunting scenes, but Dr. Steven Waller, an American researcher and Acoustic archaeology expert, has presented new evidence that the images may have been inspired by strange noises emanating from the mouths of the caves. Waller believes that ritual clapping outside the cave could have caused echoes that early people mistook for hundreds of hooves drumming on the ground in the cave. Similar echoes of other noises could have been perceived as the voices of supernatural beings.