Maggia broke away from the parish of S. Vittore in Murano in 1000, to form their own parish. The church in Maggia was the first parish church of the lower Maggia valley. It was the mother church of the other parishes that developed in the region in the following centuries. The current church of St. Mauritius was built in 1636. In 1855 the front facade was extended, followed in 1881 by a monumental staircase. The church was renovated in 1996-98. The Oratory of Madonna delle Grazie was built in 1510 on the site of an earlier chapel. It contains frescoes from around the construction and votive paintings by Giovanni Antonio Vanoni. In the Antrobio chapel there are frescoes from the 15th Century, which are among the oldest in the valley.