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Child-oriented museum of natural history. It's set in Plaine d'Ansot, a large riverside parkland.
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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.
Almost as grand as the cathedral, this was completed in 1869 in neo-Gothic style.
Baionako Euskal Museoan
Excellent introduction to traditional Basque culture and the town of Bayonne. It's housed in the 16th century Maison Dagourette.
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.
Pleasant gardens just west of the Old Castle.
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.