San Lorenzo Castle is surrounded by ancient external walls, dating back to the 9th century. It is protected by a moat. The Gothic style castle has been restored several times during centuries.
The castle is visible from very far away, even if it is not on a hill, thanks to its six towers and wide crenellations, which were used by the defenders to protect themselves. A small avenue of 150 meters, which enters in the northern part of the park, leads the visitor to the façade of the big building. The central tower has painted on it the symbol of the castle’s owners.
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.