http://maps.google.com/

Google Maps gives students and teachers access to up-to-date, online map and satellite images for the entire world. This provides a great tool for studying out planet across a number of subjects, including geography, history, politics, science, PSE and more. By placing markers on maps, students can create their own layer of meaning above Google’s content. For instance, students can plot onto a map all of the battles within a war, or all of the places where their has been recent volcanic activity.