Although not as famous as those at Giza, the Red and Bent pyramids of Dashur in Egypt may have had the same function as the Great pyramid; massive acoustic and or vibrational generators made long before the presence of the Pharaohs.
2014
Ancient
ancient buildings and monuments
ancient civilization
ancient structures
giza pyramids
pyramids
sound frequency
sound waves
vibration
Inside the Red Pyramid Of Egypt: Acoustic Resonance Testing - Apr 19, 2014