Basic features user guide
The Tour Guide feature in Google Earth displays interesting places around the world, even if you didn’t know to search for them. To open, click in the bottom lefthand corner of the screen.
Thumbnails of available pre-created tours will dynamically update with interesting locations in your current view. Click the thumbnail image to start a tour or to fly to a point of interest. Flying tours are marked with a tour time in the lower righthand corner of the tour thumbnail. Points of interest are unmarked.
Where available, the tours and points of interest include 3D models for the most realistic experience possible. Information from Wikipedia also provides more information on famous sites, so you can learn more about the places that interest you as your virtually fly over them. The tour guide also includes user-contributed Picasa and Panoramio photos as thumbnails for a preview of the featured location.
If you wish to turn off the Tour Guide, simply toggle off the Tour Guide option in View > Tour Guide.