The Collegiate Church of Santa Maria Assunta is a historic church located in the town of Castiglione Olona, Italy. Built in the 15th century, it showcases a blend of Gothic and Renaissance architectural styles. The church is renowned for its beautiful frescoes and intricate details, making it a significant cultural landmark in the region. Inside, visitors can admire the stunning artwork, including works by the artist Masolino da Panicale. The church serves as a testament to the artistic and religious heritage of the area, attracting both tourists and scholars interested in its rich history and artistic contributions.