[ml/nj]

The caption I posted along with this picture is:

Andrew shows our "tunnels" tour group the extent of a huge stone in
"The Wall" (Forget the pyramids! How did they build this thing?!)

ML/NJ

[RightWhale]

There are even bigger ones underneath. How did they do this?

[kenavi]

I recall reading an archaeologist who believes that the stones were first cut out in a cylindrical shape, and so could be rolled to where they would be fashioned into blocks and inserted into the construction.

I got the impression that the builders knew what they were doing, and didn't use slave labor apparently.