Acoustic Archaeology: When Stone Was Tuned to Sing

Seven ancient sites across four continents produce measurable acoustic effects that peer-reviewed science can document but cannot fully explain. Malta's Hypogeum amplifies male voices while ignoring female ones. Chichen Itza's pyramid echoes with the cry of a sacred bird. Stonehenge's bluestones ring like bells. The measurements are real. Whether anyone planned them is the open question.