15 Unsolved Mysteries That Cannot Be Explained

15 unsolved mysteries that cannot be explained. We take a look at these 15 unsolved mysteries that cannot be explained. Did ancient civilizations use sound technology? There has been much speculation about whether ancient civilizations used sound technology to accomplish various tasks. While there is no definitive evidence to suggest that this was the case, there are some intriguing clues that suggest that ancient peoples may have had a much greater understanding of sound and vibration than we previously thought. One of the most intriguing pieces of evidence for the use of sound technology in ancient civilizations is the presence of various acoustic structures that have been discovered around the world. Thank you for watching! Thank you to for the background music!