The Church of San Sebastiano dates from the 16th century and is located in Piazza Garibaldi, in front of the Cathedral. It was built as a tribute to said Saint by the people in gratitude for deliverance from the plague. In 1711 it was altered along its whole length to make space for the Piazza Garibaldi. As a result, a new façade was designed by Pasquale Saetta in the late 19th century. It is embellished with columns employing all three classical architectural orders: Doric bases, Ionicin central sections and Corinthian crowns. There are also niches containing statues of the sculptor Francesco Biangardi, who worked in Caltanissetta during the late 19th century. The centre sculptures represent the saints Peter and Paul; the upper band shows San Sebastian pierced with arrows, being created in memory of his martyrdom.
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The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.