Unraveling the Mysteries of Alleged Ancient Civilizations and Their Lost Technologies

8. The Hypogeum of Ħal-Saflieni and Acoustic Engineering
This underground labyrinth on the island of Malta, dating back to 4000 BC, is renowned for its exceptional sound properties. Voices within certain chambers can be heard throughout the entire complex, suggesting an advanced understanding of acoustics by its builders. This technology could have been used for ceremonial purposes or communication throughout the Hypogeum.