re: #965 Ojoe
If you walk half way around the tower of Pisa it will then lean to the right.
Anyway they have recently corrected its lean to a safe tilt by taking, under great control, small amounts of soil from under the uphill side, by drilling down laterally from a distance.
If you drink enough Chianti, it looks pretty darn straight too!
I was impressed by just how far it tilts when I saw it. I was almost waiting for it to fall over.