Museo Nacional de Cerámica y Artes Suntuarias (Museum of Ceramics)

The ceramics collection is fascinating, but you can also go just to marvel at the building itself — the Palacio del Marqués de Dos Aguas, an 18th-century rococo palace. The exterior alone is worth a visit for the dramatic alabaster carvings over the entrance. And the rooms inside are stunning, with hand-painted ceilings and gilded details throughout.