I happened across this image as we so often do on the web. After looking at it a few seconds, I realized it was constructed stone by stone. I can’t be sure no mortar was used but I don’t see any.
How much patience and care does it take to construct something like this? To know which stone goes where? And then that big mother near the top of the image… did one of the guys working on this mutter, “Damn! This bastard could have gone near the bottom, Clive! Use yer head, man!”