The big three Internet search companies all offer high-quality, free satellite maps that span the United States. If a house seems good, take a minute and browse the surroundings. It may not bother you living near a railroad, cemetery or power plant, but don’t you want to know about it? These quick and painless searches can also reveal positives the sellers failed to mention: the small park two blocks away, a widening of the river or a shortcut to work.
You can start at Google Maps, or if you have a bit more bandwith, Google Earth.