The Municipal Museum of Vigo, called "Quiñones de León" contains one of the best permanent collections of Galician painting, as well as an interesting archaeological section. It is located in the pazo of Castrelos, one of the most architecturally outstanding pazos in Galicia, a building whose origin is the old pazo of Lavandeira, built in 1670, years after the foundation of Captain Juan Tavares in 1665. It is surrounded by gardens with French and English influences. The museum was inaugurated on 22 July 1937.

The ground floor conserves the setting of the former residence of the marquises who donated the manor house, with period furniture and decoration, and the permanent exhibition of European painting from the 17th and 18th centuries bequeathed by Policarpo Sanz. The collection includes some important pieces of classical Italian, Dutch, Flemish, Spanish and French painting from the 15th to 19th centuries from the legacy of Policarpo Sanz.

The Museo Municipal Quiñones de León shares its collection with the Francisco Fernández del Riego Art Gallery, as both are owned by the municipality. It also has works by authors such as Aureliano de Beruete, Alberto Datas Panero and Isaac Díaz Pardo, among others.