You should take a look at King Henry's Mound in Richmond Park, which is maybe 10 miles away from St Pauls cathedral, but with a protected view. You can clearly

You should take a look at King Henry's Mound in Richmond Park, which is maybe 10 miles away from St Pauls cathedral, but with a protected view. You can clearly see the dome through carefully designed passages of trees and lack of building obstructions all the way to central London. Pretty cool to see.