The centre of the Plaza is a pedestrian precinct, with one end dominated by the Teatro Juan Bravo presumably a theatre, and dating from 1917.
But on the western side is the cathedral. It was the last Gothic cathedral built in Spain, begun in 1525 and finally consecrated in 1768. There's an admission fee to enter, and I paid to go in. But by this time, I think I had seen enough magnificent cathedrals to last a life time, and took no photos (perhaps they were not allowed), and don't really recall much of interest.
The entrance fee is to help restore the cathedral, and indeed the scaffolding is around the tower for just that purpose.
Continuing to the end of the old city there is a park and the Alcazar. This is a view from the park, looking back towards the cathedral, and also showing the forest outside the city walls.
The Alcazar entrance, dominated by the Tower of John II. Not visible is the valley between the park where I was standing and the castle itself. It was at least 10m deep, perhaps even 15m!