Historical buildings in and around the town include the pentagonal Pillau Citadel, founded by the Swedes in 1626, completed by the Prussians in 1670, renovated in 1870, and currently holding a naval museum; the ruins of the 13th-century Lochstadt Castle; a maze of 19th-century naval fortifications; the Naval Cathedral of St. George (1866); the 32 meters Expressionist observation tower (1932); the Gothic Revival building of the Baltic Fleet Museum (1903); and an elegant lighthouse, dating from 1813-1816.