The Basilica della Collegiata was built in the early 18th century, after the earthquake of 1693 that had destroyed most of the city.
The design of the church is attributed to Angelo Italia (1628–1700), who changed the orientation of the previous edifice destroyed by the earthquake, in order to have it facing the new via Uzeda (current Etnea Street) according to the rebuilding plan of the city. The façade, designed by the polish architecte Stefano Ittar (1724–1790), is one of the most notable examples of late Baroque in Catania.
It has two orders, the first of which featuring six stone columns, surmounted by a balustrade. The second order has a large central window, with, at the sides, four large statues of St. Peter, St. Paul, St. Agatha and St. Apollonia. Over the second floor is a central element housing the bells.
The church is accessed through a large staircase on which, delimiting the parvise, is a wrought iron parapet.
The interior follows a common basilica plan, with a nave and two aisles divided by two pilasters, and three apses. The central apse is rather elongated to house the rectory.
The right aisle is home to a baptistery and three altars with canvasses of saints. At the end of the aisles is the Immaculate altar, preceded by a marble balaustrade, over which is a marble statue of the Madonna. In the apse of the nave is the high altar, with an icon of the Virgin with a Child, a copy of a Byzantine original in the sanctuary of Biancavilla. Behind the altar are an 18th-century wooden organ and a wooden choir.
The left aisle, in the apse area, houses the Holy Sacrament Chapel, with a marble altar. The vaults and the dome were frescoed in 1896 by Giuseppe Sciuti with scenes of the Life of Mary, Angels and Saints.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.