Torre Fiorenzana is a tower house built in the late 12th century for the local de Grono family. The first mention of the family is 1219. They appear again in local records in 1286 and 1288. The Canon Bernardinus of Grono and the Provost Heinrich appear to have been the last male members of the family. By 1314 it was owned by the powerful Lords of Sax-Misox and a branch of the family inhabited it. In the 14th century they were signing documents as de Saco de Grono and in the 15th century were de Saco de Fiorenzana. According to tradition, in 1406 the powerful leader of the family, Albert von Sax, was murdered at Fiorenzana.
In the 16th century the tower was locally owned. The coat of arms of the Three Leagues was painted on it at that time. Over the following centuries, it was inhabited by a number of local families and today remains privately owned. The exterior was studied and repaired in 1978.
The castle is located in the center of Grono village. It is a five-story, rectangular tower. The crow-stepped gables along the roof were added by the Lords of Sax-Misox in the 14th century. The original high entrance was located on the third floor and is still visible.
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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.