Historical geoportal is an application that mashes up a few services such as National Polish Geoportal or Google Earth with the historical topographic map services offered by Cartomatic. Such a combination of tools makes it possible to view the historical information against its current spatial context. Users can view the maps in 3D, test the old maps accuracy or search for the old place names. The project also involved apprenticeships for students so they could learn modern cartography techniques and help with the data preparation at the same time.