The patron saint of Cervo is Saint John the Baptist, celebrated on 24 June. The parish church dedicated to him, in the historic centre, was built between the 17th and 18th centuries partly with the proceeds of coral fishing, hence the nickname «church of the coral fishermen» (Corallini); with its concave façade it overlooks the square of the same name, whose natural acoustics were recognised in 1964 by the Hungarian violinist Sándor Végh, who founded there the International Chamber Music Festival of Cervo, still held every summer with open-air evening concerts.
Among the town's other religious buildings is the church of San Nicola da Tolentino, whose original building, according to some studies, was erected on the ruins of an ancient pagan temple, and the former oratory of Saint Catherine of Alexandria, built in the 13th century as the village's parish church in single-nave Romanesque architecture. Behind the historic centre stands the Clavesana castle, built by the marquises of the same name around the 13th century incorporating an earlier Romanesque tower, today home to the ethnographic museum of the western Ligurian Riviera.
