Description: Construction of the Island Castle on one of the larger islands of Galvė Lake began in the second half of the 14th century; at the same time, modernisation of the Peninsula Castle took place. Initially, the Island Castle had elements both of enclosure and convent types; it had a U-form ducal palace and an outer ward. Presumably, the construction of the castle was begun by the Grand Duke Kęstutis and was concluded in the early 15th century by his son Vytautas. It was meant to be a fortress, and it was never conquered by any raiders.
In 1962, the Island Castle was conveyed to Trakai History Museum. Both permanent and temporary exhibitions are now open to the visitors; numerous concerts, festivals and other events take place in the Island Castle in the present days.