This is the bell tower of Santi Apostoli, in Venice.
It was built in 1450, and in 1659, the belfry
was blown off during a bad storm. According to
some, during the reconstruction an old
priest went up to check things out, slipped and
fell, and his robes got caught on the arms of
the clock, and there he stayed until he was rescued.
(I like an urban legend with a happy ending—don't you?)
[To see more churches from around the world, go here.]