The “Castello” was built in the first half of the 13th century as home to the de’Ghiriglioni, a noble family originating from Milan.
The small fortress originally encompassed an area of 41 x 54 metres enclosed by a wall with four guard towers at each corner. The south-eastern wall bordered directly on the lake and the castle disposed of its own boat jetty. Moats around the three remaining walls offered further protection from potential aggressors.
After 400 years the de’Ghiriglioni family returned to Milan and with their departure the further history of the “Castello” was lost.
While the western area of the castle was almost completely destroyed over the centuries to make space for newer buildings, the eastern part – what is today part of the Hotel Castello Seeschloss – was used as private lodgings until the beginning of the 20th century and remained relatively well preserved.