Many of us may never get the opportunity to travel to famous places or centres of world culture due to family responsibilities, lack of time, inclination, visas, or money (o.k. that's the main one). However, due to the newly enhanced capacity of Google Earth http://www.google.com/earth/index.html, we can travel through actual streets and arrive at the desired addresses. Virtual tours of many world centres are available. One of the most useful for the student of history is the Smithsonian Institution http://www.si.edu/. Just think of the money you've just saved.