Uh-huh?? Acharya, You forget that God created the world only 6014 years ago
It would not surprise me at all. If there's one very ancient advanced site - Gobekli Tepe, which is some 11,500 years old - there is little reason there couldn't be many more since then. Moreover, it's becoming more widely accepted that sea-level rise at the end of the last glaciation inundated coastlines, where the bulk of humanity has lived since time immemorial, doubtlessly drowning numerous such sites.