Google Street View is a feature of Google Maps + Google Earth. It provides for many streets in the world 360° horizontal and 290° vertical panoramic views from a row of positions along the street (one in every 10 or 20 meters, or so), from a height of about two meters.
Google launched some great improvements to this tool. Google has implemented “Smart Navigation” which makes you walk and/or stalk virtual a lot easier, and way, way cooler.
Try it out here, we are now at Rue Saint-Antoine, Paris, France. It is really cool!