The Palácio dos Condes de Castro Guimarães, originally known as the Torre de São Sebastião (St Sebastian's Tower), was built in 1900 as an aristocrat’s summer residence in Cascais, Lisbon District, Portugal. It became a museum in 1931. The building follows an eclectic architectural style, while the museum includes paintings of national and international significance, furniture, porcelain, jewellery and a neo-Gothic organ.