So much of what we are taught about history is false. Petroglyphs that have been in multiple cultures going all the way back to the Aratta Civilization, which predates Sumerian Culture. You are looking at remains of a Society that has been linked around the world, that could go back over 100,000 Years. Since then, there have been many people and cultures that have taken over the grounds.
Diamond, from Oppenheimer Ranch was with me on the adventure, check out his YouTube channel.