Modern architecture has moved to the computer in a big way. We can use a computer for planning, drawings, CAD design, layout and blueprints.
But not that long ago all those architectural drawings were painstakingly rendered on paper. I came across this web resource that achieves hundreds of architectural drawing from the 18th century. And they are available for study.
“They include plans, elevations, sections and perspective drawings of individual buildings and parts, details and features of buildings and other built structures…”
Like a lot of government sites the archive is a bit hard to navigate, but definitely some interesting stuff.