Where on the internet can I find a map of Germany and Prussia from the 1700's-1800's and also shows present Poland where I can site the cities?

I am trying to find an internet site that has a map showing the cities where my ancestors lived in the late 1700’s and 1800’s in Prussia. I want to be able to “star” those cities that have German (Prussian) names, and then the same map, after Prussia became Poland, with the Polish cities’ names. I want to cite the cities, all at the same time on the map, so that I can see their proximity to each other both when they were in Prussia and now in Poland. Many thanks!