I think what I loved most was checking out the lovely building facades and going down the beautiful streets. Here are some gorgeous photos of buildings from some of my favorite photographers on flickr.
To navigate around Google Maps you go to http://maps.google.com and then type in where you want to go. All you do is zoom in until you see a little yellow man and then it will take you into street mode and then you can click on the arrows to move around. They don't have every place in the world but most of the bigger site seeking places are on there. If you decide to do some virtual traveling have fun!
Here are some places I have visited. :)