In the Plaza Mayor stands the Norman/Gothic Cathedral (12th-13th century); the facade was rebuilt after it collapsed in 1902. The richly decorated interior was left unscathed. The 18th century high altar by Ventura Rodríguez is separated from the rest of the church by magnificent grilles dating from 1557. The triforium in the ambulatory is the only one of its kind in Spain.
In the north aisle is a very beautiful Renaissance arch, the Arco de Jamete. Two particular treasures are a "Mater Dolorosa" by Pedro de Mena (13th century) in the sacristy and a "Crucifixion" by Yáñez de la Almedina in the Capilla de los Caballeros.
Built on to the Cathedral is the Palacio Episcopal (Bishop's Palace), on the three lowest floors of which is the Diocesan Museum. Among its principal treasures are two paintings by El Greco (''Christ on the Cross'', ''Prayer in the Garden of Olives''), a 13th century Byzantine diptych from Mount Athos, fine pieces of goldsmith's work and valuable tapestries.
Two carved walnut doors by Alonso de Berruguete give access to the chapterhouse, which contains the valuable cathedral treasury though some of the finest items are in the Diocesan Museum.