The Cathedral of Mazatlan is devoted to the Immaculate Conception. It's Neogothic architectural style has pointed arches on the facade. Its construction began in 1856 by Bishop Pedro Loza y Pardave, although much of the credit for its development and conclusion is due to the priest Miguel Lacarra, who finished building the church in 1899, which in turn would become consecrated as a Basilica in 1937. It has three naves of similar height, and two towers with tips in the form of truncated prisms. It also reveals a certain neo-classical influence, due to the strong tendency at that time towards eclectic architecture. It has a tubular organ that was built in 1886 by a French teacher Aristide Cavaille-Coll, for which total restoration has been scheduled for the year 2010.