Google has released a major update to its Google Earth iOS app adding support for 3D cityscapes along with a new Tour Guide feature. Google Earth 7.0 now allows users to access a 3D flyover view of select cities; 3D imagery currently is currently available for Los Angeles, Boston, San Francisco, Geneva and Rome with new cities said to be added in the coming weeks. A new Tour Guide feature in the latest version also allows users to virtually explore new places with tours of major cities, historic landmarks and natural wonders. Google Earth 7.0 is a universal app requiring iOS 4.3 or later and is available from the App Store as a free download. The new 3D imagery feature requires an iPhone 4S, iPad 2 or third-generation iPad.