Check out my book about ancient Mexican wonders:
https://www.amazon.com/Ancient-Technology-Mexico-Brien-Foerster/dp/1981057560/ref=sr_1_16?dchild=1&keywords=brien+foerster+mexico&qid=1598790801&sr=8-16
Palenque: Mayan Jewel In The Mexican Jungle With Megalithic Surprises
