The Carlo al Corso church replaced an earlier church. This church likely designed by Rosario Gagliardi, was part of the town reconstruction after the 1693 Sicily earthquake.
The concave façade has three superimposed orders of columns, identified by their capitals from base to roofline as Doric, Ionic and Corinthian; in the progression expected in classical construction. The third story has floral oculus. The interior has a longitudinal layout with a barrel vault sustained by pilasters. The main altar was rescued from the prior church.
Inside the church, the 18th-century altarpieces display a Sacrifice of Isaac; a Flight into Egypt; a Deposition; San Carlo Borromeo ministering to those ill with the plague; a Virgin and Child with saints; Biblical Scene; St Ignatius of Loyola, founder of the Jesuit order; and wood icon of St Aloyitius Gonzaga, another Jesuit saint. The main altar is flanked by marble statues symbolizing Faith and Hope respectively, sculpted by Giuseppe Giuliano. The nave ceiling is frescoed by Costantino Carasi, depicting the Transfiguration and the Healing of the Paralytic, with a central panel depicting the Triumph of the Agnus Dei. The spandrels that support the dome are frescoed with the evangelists, and just below are four allegorical statues depicting the respective cardinal virtues.
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.