Back on Earth there are many early Olmec sites but the Mayans have on occaision built on top of other ancient structures so even lidar can not show everything.

The Olmec people interest me the most since they are the most global cosmpolitan ancient civilization I have ever seen. There are quite a few links with India Hindu statues of various gods like Garuda and Shiva as well as stone heads with African features. Europeans, not so much.

I am leaning toward India as the heart of ancient civilization. Now I will look at the genetic records, architecture and dates to see if my guess is reasonable.