Google Street View added “Smart Navigation” to provide 3D navigation between Street View panoramas, and an option to browse user-contributed photos that match Street View images. Google’s bringing these concepts together to make it easier to explore photos; Now “when an image’s first shown in photo viewer, a small set of zoom polygons’re shown indicating close-up photos. Subsequently, moving the mouse around, highlights best polygon near the mouse. Similar to smart navigation, double clicking on shaded rectangle jumps you to the corresponding photo. After one or more jumps, the back button appears next to photo title to give you the option to move back through the selected sequence of photos,” explained LatLong blog.