The Osher Map Library at the University of Southern Maine has been photographing and scanning in a huge collection of maps that span several centuries. It’s an opportunity to see some wonderful and beautiful hand drawn maps from the past. Some of these could be useful for an RPG adventure.
This Ptolemaic map from around 127AD is a great example. It also calls into question whether or not ancient scholars understood that the earth was in fact round.
Creatio Universi, 1720. Engraving of the creation of the universe, the Earth surrounded by planetary orbits engraved by Fuesslinus who worked in Augsburg, Germany.