Katheryn Rivas shares a list of virtual tours of cities, museums, famous landmarks, and buildings. As she notes, "you can learn how things are made, explore the human body or that of a life-sized whale, and visit ball parks and theme parks. There is even a section of incredible virtual tours that Google Earth has compiled that shares the world in a whole new way." The tours would be appropriate to use in history, science, geography, and art classes, among others. You can access the list of 100 educational virtual tours here.