I remember as a kid hearing of Hadrian’s Wall and thinking of something like the Great Wall of China. When I finally made a trip to England, I took a side trip to see the wall. Instead of a massive wall of unscalable height, there was this puny 3’ pile of rocks that I could jump over. Turns out, the wall really wasn’t one of defense, but rather a line to tell the Scotts that the Romans didn’t want to mess around with them if you stay north of this line.
There were no Scots when Hadrian built the wall.