History: Maps of the World is a free iPad app that puts historical maps on your students’ iPads. The app features close to 200 maps across four categories. The map categories are World War II, Polar Regions and Oceans, The Public Schools Historical Atlas, and general information. Of the four categories the WWII category probably has the broadest appeal. Each of the historical maps includes a short description and a link to website (usually Wikipedia) to learn more about the place featured in the map. Students can also switch from a historical view to a modern map view.
History: Maps of the World is one of six apps in a series from the same developer. The other variants of the app cover U.S. History, Asia, Africa, the Middle East, and Europe. None of the apps are terribly impressive, but as free apps they could be good to use as supplements to your other history resources.