With tools like Google Earth, historians can construct interactive and engaging forms of history. Users can generate graphical representations of events to visually convey events. For instance, Google and the US Holocaust Memorial Museum (USHMM) collaborated to spread awareness of the genocide in Darfur [link]. The overlay they generated includes descriptive HTML that presents users with first-hand testimonies, pictures, the locations of refugee camps, and links to video clips. The Darfur map included an overlay that could be turned on that displayed 3D columns to visually represent the numbers of displaced persons. Teachers may speak of 200,000 displaced individuals, but to visually represent such numbers conveys greater weight to a subject. The same approach could be taken with historical events, such as using columns to display war casualties in World War II or the location and relevant information of Nazi death camps. Additionally, students could get an idea of how early cartographers viewed the planet with the Dave Rumsey historical maps [link] or explore the geographic and historical data related to the 1906 San Francisco earthquake [link].