Google Maps
http://maps.google.com/maps?q=Piazza+di+Porta+Maggiore,+Bologna,+BO,+Italia&hl=it&ll=44.490031,11.35746&spn=0.00721,0.019205&sll=44.493842,11.343749&sspn=0.007209,0.019205&oq=Piazza+di+porta+Maggiore,+Bologna,+BO,+Italia&t=k&hnear=Piazza+di+Porta+Maggiore