Right in the middle of the historic center you find another beautiful preserved Colonial mansion: The ‘Casa Miguel Grau’. Built in the last years of the 17th century the house was occupied by the Oidor Don Gaspar Osma y Tricio (Oidor = Spanish: hearer, a judge of the appeal court), later by the Peruvian writer José de la Riva Agüero y Osma. In 1867 the famous Peruvian Navy Admiral Miguel Grau lived here until his death during the Pacific War in 1879...

Even after being the home to many families, being utilized for shops and housing a restaurant the original architectural style survived. Since 1984 the Museo Casa Miguel Grau resides in the mansion. It was opened by the Peruvian Navy to honour the life and work of the ‘Caballero de los Mares’ (the Gentleman of the seas) and his family. The museum displays a collection of photos, clothing, furniture and personal belongings of Miguel Grau and many old documents from the Peruvian Navy.