How can you study the history of geographical discoveries using a geographical map?

The history of geographical discoveries using maps can be found in several ways. The most interesting will be the analysis of different maps of different eras. After all, previously unexplored territories were designated simply as unknown land, but in the process of discovery, they were gradually put on new maps. Also on some maps, arrows show the routes of the discoverers. And then there are various thematic maps, they show one or another historical dynamics.