Castiglione Olona is a small town located in the Lombardy region of northern Italy. It is known for its rich history and beautiful architecture, particularly the Collegiata di San Giovanni Battista, a stunning church that dates back to the 15th century. The town is surrounded by picturesque landscapes, making it a charming destination for visitors. The town's historical significance is highlighted by its connection to the Visconti family, who played a crucial role in the region's development during the Middle Ages. Today, Castiglione Olona offers a peaceful atmosphere, with narrow streets and quaint buildings that reflect its long-standing heritage.