Kirkkosaari ("The Church Island", also known as Köyliönsaari) is one of the oldest places of residence in Satakunta area. Two Iron Age cemeteries are located at the north side of Kirkkosaari.
According the legend Lalli, the pagan chief of Kirkkosaari manor, killed bishop Henry on the ice of lake Köyliönjärvi on January 20, 1156. Although Henry has never been officially canonized, he has been referred to as a saint since as early as 1296 according to a papal document of the time. After this the manor and island was moved as the property of Turku bishop. Since 1746 the manor has been owned by Cedercreutz family and is still in private use. Present buildings are from the 18th and 19th centuries.
The church of Köyliö has been in Kirkkosaari since the Middle Ages. The present wooden church was built in 1752 to the old cemetery site. There are also some remains of the medieval chapel in Kirkkosaari manor garden.
The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.