The Musée Goya is housed in the former Bishop's Palace and holds the most important collection of Spanish painting in France outside Paris. The three Francisco de Goya works at its centre are the headline — the Portrait of Philip IV in Hunting Costume, The Self-Portrait with Spectacles, and the engraved series of the Caprichos — but the rest is substantial: Velázquez, Murillo, Ribera, El Greco-school work, and a fine room of 17th-century Spanish still lifes.
The setting helps. The state apartments of the palace have been kept as 17th-century galleries, with the original stuccoed ceilings, and the windows on the upper floor look out over Le Nôtre's formal garden below. Allow two unhurried hours; the museum is closed on Mondays and admission is modest.