Join upcoming events being held in Castiglione Olona. Castiglione Olona is a charming Italian town nestled in the Varese province, boasting a rich historical heritage with its well-preserved 14th-century architectural gems, such as the Collegiate Church of San Giovanni Battista and the Castle of Visconti, all complemented by the lush surrounding countryside and the Olona riverbank, offering visitors an enchanting blend of art, culture, and natural beauty.