-Gobekli Tepe-
Built by those who came before the last great cataclysm. Intentionally buried 12,000 years ago to preserve their knowledge and records of Astronomy, Precession of the Equinoxes, etc.
Just like Masons encoded their legitimatly profound and universal knowledge in esoteric symbolism in the Cathedrals of Europe, the ancient peoples shared their knowledge and culture (globally) in these megalithic sites.
Just like today, the infiltration and subversion of organizations by a small number of truly evil people should not cause us to dismiss the achievements and knowledge of our ancestors.