A prominent structure that's withstood the passage of time, don't miss Torre Beccati QuestAltro. It's a popular attraction for history fans and regular tourists alike.
You'll be spoiled for sightseeing choice when visiting Castiglione del Lago. Torre Beccati Quest'Altro is a good place to start here, but there are plenty of other interesting places to experience. Chiusi Lake, Chiusi National Etruscan Museum, and Chiusi Cathedral Museum are not far from the historic construction and will fill in your day nicely.