Google Earth
Wow! Google does it again. If you thought Google maps was cool, then Google maps with satellite images was even cooler, you ain't seen nothin' yet. Go to earth.google.com, download their app, and prepare to have your socks knocked off. You can actually fly over any area of the U.S., panning, rotating, tilting, and zooming at will. It's almost like having a private helicopter available at your fingertips. While you can't read the license plate off a car in a parking lot, you can certainly get a feel for what an area looks like if you've never been there before.