Speaking of SPQR (see previous post) made famous in many a Roman movie, one of my favorite maps was the one at the front of every Asterix book. This shows the indomitable Gauls holding out against the invading Romans. The latter had their territorial claims represented by a huge flag driven into the ground bearing the SPQR banner. If a true scale was being used it was probably several hundred miles high, something which intrigued me at the time (especially the cracking of the ground around the base).
It’s one of the first maps I remember paying attention to as a child.