Hello. I've just found this forum as I am looking for an answer to a question. For what it's worth, by way of introduction, I am a software and telephony engineer, with interests in aviation, boat design, and energy-efficient houses. I also write when I can. Here's my question. Plenty of ancient and old structures use cut stone structurally. The Romans (and, I have found with a quick Google) the Egyptians used mortar as a bonding agent, to extend the capabilities of stone and fired brick (fired brick being an Indian invention of about 3000 BC). Structural concrete seems to be a 19th-century French invention, and (along with steel) is the usual material for large structures today. My question is: Was there ever a culture that used machine-cut stone much? Or did everyone go from natural (or hand-cut) structural stone, to structural concrete and steel, with fired brick for smaller structures? I can't even think of an example of a structure that used machine-sawn stone. Thanks.