Google Earth - Interactive tours of places on the earth, including text, images, and links.The application for viewing the tours and places is free, and available at the Google Earth website.
Unfamiliar with Google Earth? This exciting and effective educational tool is explained through images and tutorials at See Google Earth in Action.
If Google Earth AND Google Sketchup are installed on your computer, the three dimensional SketchUp models will be visible as part of the Google Earth tour The models may also be downloaded individually and viewed within the SketchUp application. SketchUp is not required for viewing the Google Earth tours.