The Sayhuite Stone

[Toroid]

This interesting carved stone is located about three hours from Cusco, Peru. It's believed to be a model of the Inca Empire.
Sayhuite - Wikipedia

www.youtube.com/watch?v=9NK0XXGAM

Published on Aug 15, 2017
About 47 kilometers east of the city Abancay, in southern-central Peru, lies the archeological site of Sayhuite or Saywite, described by historians as a center of religious worship for Inca people, who held rituals and ceremonies for the worship of water. The site’s main attraction is a big granite block whose upper surface is ornamented with complex and mysterious figures resembling a three-dimensional relief map of an ancient city.
Source: http://www.amusingplanet.com

 

[FFH]

I really want to think it's the plan of an underground city, but the animal carvings are seen on the surface so that denies that possibility.

 

[Castle-Yankee54]

Interesting idea....not sure how this is a hydraulic map.....but its very interesting.