The Chiesa del Purgatorio is dedicated to all saints and the souls in purgatory. It was first consecrated in 1658, erected under the patronage of the Mazza family. The earthquake that nearly levelled Ragusa, left this church mainly untouched, and in 1694, it took over some of the functions of the nearby church of San Giovanni, that had moved into a new district of Patro. In 1729, this church was placed under the jurisdiction of the church of San Giorgio.
A bell-tower was added in the early 18th-century. But too small for the district, in 1740, a new church was begun with a central nave and two chapels, separated by columns with Corinthian capitals (1741). The three order facade was completed in 1757, but the presbytery completed in 1787, when it underwent reconsecration.
The church is preceded by a steep staircase to a small piazza degli Archi. The chapels of the Holiest Sacrament and the Holiest Crucifix have altars respectively depicting St John the Evangelist and the Addolorata. The main altarpiece depicts Saints and Souls in Purgatory by Francesco Manno. The cornice has depictions of earthly glory interspersed with skulls as a Memento mori.
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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.