Wildenburg castle was founded in the 13th century by the Lords of Hünenberg, vassals of the counts of Kyburg and Habsburg. The first plant was probably just a stone ring wall with wooden buildings. A round keep and a palas in the northeastern corner were added later. In 1386, the knights of Hünenberg fought against the Confederates at the Battle of Sempach on the side of Habsburg Austria. Wildenburg was destroyed after that. The castle was then left to decay and used as a quarry in the 16th century.References:
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.