Google Earth is fantastic. I have blogged about the usefulness of Google Earth for tourism but it is also great for just plain geography.
If you don't have it on your computer or smart phone, get it right away. Not only can you see areas from above, but ground based pictures are also available. A great way to study the Earth.
For example, next week I will be in Maryland and might be able to see this haunted landmark.
Use Google Earth to explore!