The Church of the Three Crosses (Vuoksenniska chruch), designed by academician Alvar Aalto, is architecturally an interesting building. Its slender, high belfry describes a down shot arrow. Instead of the altar painting there are three crosses. Among the 103 windows only two are identical. Aalto planned the church also for other activities in the parish besides services. Therefore the church can be divided into three parts. In the church there are seats for 800 persons. The windows and lightning are high up, which creates fascinating display of light and shadow. The Church of the Three Crosses was completed in 1957. The stained glass on the ceiling is as old as the church and also designed by Alvar Aalto.
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.