One of the best qualities inherent in a map is its ability to visualize the past. The Historic Earth iPhone app (formerly the Old Map App), created by Emergence Studios in partnership with Historic Map Works, puts this quality in a pretty package available for download from the iTunes App Store. Historic Earth overlays historic maps over current day maps of the same location using geocoding technology, and currently consists of over 32, 000 maps of various US cities and states. The app allows you to find maps from your current location automatically using GPS, manually search by city, zip code, or address, pan and zoom to a map location, and rotate maps using the compass on the iPhone 3GS. The Historic Map iPhone App is available now from the App Store for a limited time price of $5.99.