This is a view of the Torre from the old wall
near the cathedral. The wall was part of an enormous cathedral
that Siena had planned but had to be abandoned when they were hit by
the plague. The Siena cathedral is a very impressive building and
this new cathedral was so large that it was going to use the existing
cathedral as a wing of the new cathedral. Take a look at this page
for a view of this wall from the tower itself.