Straßburg Castle fas first time mentioned in 1147. It was built by Roman I, the bishop of Gurk. The chapel was built in the late 12th century, consisting of nave, chancel and apse. In the 14th century, the chapel was raised by one floor, and another floor was erected in the 15th century above the choir. The last modification to to the choir took place in 1682.
In the 14th century, the eastern tower was built on the outside of the northern ring wall. There is a medieval kitchen, still preserved. The western tower (Münzturm) was built in the 15th century.
Today Straßburg castle hosts a folkloristic collection exhibiting objects from rural life of past centuries. The exhibition Women’s Artworks of the Werkmann collection shows unique exhibits from the past 200 years with needlework of rural life, nobility and bourgeoisie.
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.