Google Earth has been the greatest addition to geographic teaching in the last 50 years - and it's FREE! Students using it now think of Earth as a sphere, not as a series of flat maps. They are also become much more "world aware" as they navigate bak and forth and aroudn the globe.
Each link here is a kml file.
Click the link to download the file to your Downloads folder. In the Downloads folder, double-click the file to launch it in Google Earth. Alternatively, you can right-click the link below and direct the download to a specific folder on your drive.