Some of the Mayan and Inca stuff is incredible. I wonder sometimes though looking at our own landscape which are the most laudable - those like William the Bast....err lets be nice and say William of Normandy...who change a landscape and country with stone buildings and enclosures - or those like some of the First Nations who tread so lightly on the earth that they leave almost nothing behind? Certainly some are more remembered - or at least marked - but it calls to mind Ozymandias somehow.
Some of the first nations (if youre including aztecs, mayans and incas) didnt tread that lightly at all and deforested large areas for organised agriculture on industrial scales for the time period.