A somewhat better depiction of Christ.
Now this is the mausoleum, an octagonal building form the outside but circular inside, with a finely created brick dome.
The doors are worthy of mention, if only that they survive from the 13th century
So then onto the climb of the bell-tower. This is particularly of note I feel because it was begun in the 13th century but not finished until 1908. Now that is a long-term construction project. Of course, why you do it is for the views, not just from the top but all the way up.
And finally, down a little alleyway opposite the cathedral is the baptistery, whose attraction is mainly that it isn't a baptistery really but an adaptation of a Roman temple built by Diocletian.
Of course it has had many later accretions, including a skinny John the Baptist which actually dates only from the 1950s.