The earliest church on this location in Tofta was probably built during the end of the 12th century. The oldest part of the presently visible church is the tower. The nave and choir both date from the middle of the 14th century. The church walls display fragments of medieval frescos that were found during a restoration in 1958-1959. A few medieval stained glass windows are likewise preserved in the church.
Of the furnishings, the baptismal font is the oldest, dating from the 12th century and richly sculpted. It was probably made for the earliest church. The high altar has a retable from the 14th century, probably made in Lübeck. Two other wooden sculptures from the same century are also preserved in the church, one of the Virgin Mary and one of St. Olaf. An unusually well-preserved medieval bench also stands in the church. In the floor of the choir is a gravestone, made for a farmer and his son who were beaten to death in 1340. The pewsand the pulpit date from the Baroque era.
In 2004, an extremely well-preserved mail coif was discovered in a room in the tower during cleaning of the church. Reputedly it is one of the most well-preserved mail coif ever found in Europe, second only to a similar one displayed at the National Museum of Scotland. It may be connected to a civil war that was fought on the island in 1288. The mail coif is now displayed inside Tofta church.
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.