Portugal and Cascais during the Second World War. The Cascais Citadel Palace Museum is situated inside the grounds of the Citadel. It was used as the summer residence of the Royal Family from 1870 until 1908, and was subsequently used as one of the official residences of Portuguese presidents. After extensive restoration it was opened as a museum in 2011, with an emphasis on the role of Portuguese presidents. Condes de Castro Guimarães Museum. This was built as an aristocrat's summer residence and became a museum in 1931. The building follows an eclectic architectural style, while the museum includes paintings, furniture, porcelain, jewellery and a neo-Gothic organ. Casa de Santa Maria. This was built for the same person as the building housing the Condes de Castro Guimarães Museum. Both are built on the banks of a small sea cove. It was acquired by the Cascais Municipality in October 2004 and is interesting mainly for the design and the wall tiles. Lighthouse museum. This is built into the Santa Marta Lighthouse, next to the Casa de Santa Maria. Examples of lighthouse lens and other technology can be seen and at certain times the lighthouse can be climbed. Casa Sommer is a distinguished private residence converted into a historical museum. It also houses the Municipal Archives. It is the newest museum in the Quarter, having been opened in 2016. King D. Carlos Sea Museum was inaugurated in 1992. It has a variety of exhibitions reflecting the origins of Cascais as a fishing village. Town museum (). Provides an introduction to the history of the town. International relations Cascais is twinned with: Biarritz, France, since 1986 Vitória, Brazil, since 1986 Santana, São Tomé and Príncipe, since 1986 Atami, Japan, since 1990 Wuxi, China, since 1993 Sal, Cape Verde, since 1993 Gaza City, Palestine, since 2000 Guarujá, Brazil, since 2000 Xai-Xai, Mozambique, since 2000 Sausalito, United States, since 2012 Ungheni, Moldova, since 2012 Campinas, Brazil, since 2012 Sinaia, Romania, since 2018 Pampilhosa da Serra, Portugal, since 2018 Bucha, Ukraine, since 2022 Notable residents Joaquim António Velez Barreiros (1802–1865). As the Visconde da Luz, is celebrated in Cascais with two streets and a park named after him José de Freitas Ribeiro (1868–1929) Portuguese Navy officer, Governor-General of Mozambique, 1910-1911 and Governor-General of Portuguese India, 1917-1919 Ricardo Espírito Santo (1900-1955) a banker, economist, patron of the arts, international athlete & friend of António de Oliveira Salazar