The rectangular plaza is approximately 200 meters by 300 meters. Leveling the summit and then cutting away the rocky sides to make the plaza is a pretty astonishing engineering feat which was accomplished by the Zapotec Indians beginning in about 500 B.C., over 2500 years ago. The map below shows the position of the major buildings on the plaza.
It was a beautiful day for doing a bit of hiking around and learning about the different areas of the complex. The ball court is one of the oldest in Mesoamerica.
Wonder how they managed to move all these stelae (carved stone slabs).
Some of them are huge and some are probably just a part of something much larger.