Over the last 60 years I have read about and listened to many stories on how and why did the Incas build the interlocking walls so large. Who or what were they trying to keep out?
In the first place how did they remove the giant lumps of stone from a rock face? They did not have any machinery or explosives and they certainly did not bash it out of a rock face with a lump of stone that's ridiculuous. It is also ridiculuous that they made each intricate stone with another lump of stone and end up with that beautiful and tight fitting smooth finish.
There is one thing for sure, the Incas were just onlookers, they had the assistance of a far superior race. It could be said why so complicated when they could have made an interlocking wall by straight cuts in an alternating castellations style, we do know that cutting dead straight lines is common practice for them. There are plenty of examples around and to be removing 80 to100 ton stones from a rock face side, 1500 years ago they had some very advanced cutting technology, far superior to ours.
There are trillions and trillions of what we call stars in the solar system, they are all planets. Some think we were the first here, no way, and we think our technology is far superior to any other. These beings had our technology over 1,000 years ago and they still visit us to this day.
All the sceptics out there remove your heads out of the sand and see what is really happening around you.
Mr. M J T retired engineer.