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Contemporary art museum with changing exhibitions.
This is mostly Gothic, with additions at all points from Norman to 19th century. On the nave ceiling, note the English coat of arms along with French fleur-de-lys. The cloister has a separate entrance on Place Louis Pasteur.
Pleasant gardens just west of the Old Castle.
Baionako Euskal Museoan
Excellent introduction to traditional Basque culture and the town of Bayonne. It's housed in the 16th century Maison Dagourette.
Musee Bonnat-Helleu is a renowned fine-arts museum known for its outstanding collection of Old Master paintings, drawings, and sculptures, featuring works by artists such as Goya, El Greco, Degas, Ingres, and Bonnat himself.
Almost as grand as the cathedral, this was completed in 1869 in neo-Gothic style.
Gaztelu Zaharra
Château-Vieux is a fortress on Allee de Poterne 100 m north of the cathedral. Parts date back to the 12th century; Napoleon considered it of no value and ordered it to be demolished, but this was never acted on. It's nowadays a military base and you can't visit. La Poterne was its west postern gate, nowadays facing the Botanic Gardens.