According to the contract of 1254 between Saare Lääne bishop Heinrich and the High Master of the Order Eberhard von Seyne the diocesan area of Hiiumaa was divided into two parts and Käina became the center of one of them. In the middle of the 13th century a new house of God was built in the newly established parish. The building´s incinerated ruins were discovered in 1981 while clearing the nave of the church.
A stone church was erected here in 1492-1515 during the reign of Saare-Lääne bishop Johannes III Orges. It is one of the youngest and quaintest medieval sacral buildings in the Western Archipelago, a simple gothic church with a single-aisle nave. Between the years 1859-1860 Käina church was thoroughly rebuilt. The southern wall of the nave was torn down and the nave was extended with a large new added structure in the southern side of the church. At first the church´s saint was Saint Nicholas, later however Saint Martin.
On October 14, 1941 the church was hit by an incendiary bomb which, dropping in through the ceiling of the choir burned the building to the ground.
Sirmione castle was built near the end of the 12th century as part of a defensive network surrounding Verona. The castle was maintained and extended first as part of the Veronese protection against their rivals in Milan and later under the control of the Venetian inland empire. The massive fortress is totally surrounded by water and has an inner porch which houses a Roman and Medieval lapidary. From the drawbridge, a staircase leads to the walkways above the walls, providing a marvellous view of the harbour that once sheltered the Scaliger fleet. The doors were fitted with a variety of locking systems, including a drawbridge for horses, carriages and pedestrians, a metal grate and, more recently, double hinged doors. Venice conquered Sirmione in 1405, immediately adopting provisions to render the fortress even more secure, fortifying its outer walls and widening the harbour.
Thanks to its strategical geographical location as a border outpost, Sirmione became a crucial defence and control garrison for the ruling nobles, retaining this function until the 16th century, when its role was taken up by Peschiera del Garda.