Kupgal petroglyphs — Wikipedia

The Kupgal petroglyphs are works of rock art found at Kupgal in Bellary district of Karnataka, India. Thousands of petroglyphs have been found at Kupgal, which date to the Neolithic or even the old Stone Age. The site, which includes examples of rock gongs, was discovered first in 1892, but subsequently became lost to researchers until it was rediscovered in the early 21st century. This site features peculiar rock formations with unusual depressions which make musical sounds when struck with boulders.