The best of it is the grand exterior. Many visitors reckon it's not worth paying to see the ostentatious interior and endure the interminable audio guide.
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Santa Iglesia Catedral
The two buildings are joined and you enter from the north side into the New Cathedral, built 16th-18th century. Outside, note the fine Puerta de Ramos, mostly Renaissance but among its saints are an astronaut and an imp clutching an ice-cream cone. The interior is a baroque / Churrigeuresque creation, with fine ceilings, choir and main chapel. A door leads down into the Old Cathedral, 12th century and mostly Romanesque, with many frescoes.
This is now a museum of medieval art, highlight is the Gothic frescoes.
Displaying the history of commerce and industry hereabouts. The best sections are about the impact of radio.
Contemporary art in a former prison.
Displaying fifty 20th century motorbikes.