The cathedral has some amazing stained glass windows created during the 15th century and some through to the 19th century. There are 93 in all with the oldest window being in the Capilla de San Antonio which was created between 1478 and 1484 by Enrique Aleman. Other windows in the bays, chapels and upper storey of the nave were created by Cristobal Aleman and Amao de Flandes.