St. Mary's Church is a medieval stone church that would date back to the mid 15th century, probably to the 1440s. However, there have been several wooden churches in the parish, the oldest of which were built as early as the beginning of the 13th century. The walls and vaults of the church bear medieval paintings which, according to the historian Markus Hiekkanen, were painted by the church builders themselves.
Turku Cathedral was probably built in wood at the very end of the 13th century, but the present building dates from the 14th and 15th centuries. Since then, Turku Cathedral has also been renovated several times. The tower has been erected three times since the fires of 1681, 1738, and 1827. Due to the long period of construction, the cathedral displays several different styles, including Romanesque, Gothic and Neo-Gothic. Its age and the uniqueness of its architecture make the cathedral an important historical building in the country, which is often called the "National Sanctuary of Finland".
The Synagogue in Turku is an Ashkenazi synagogue built in 1912 by architects Eskil Hinderson and August Krook. This Neo-Romanesque brick building still serves as a synagogue.