Hohenberg Castle, situated adjacent to Czech Republic border, was built in the Hohenstaufen period between 1170 and 1220 to protect the important Schirndinger Pass. Around 1300 Hohenberg came to the possession of burgraves from Nuremberg. in 1433, Hans von Kotzau defended Hohenberg against the Hussites.
The present castle was built mainly (ring wall, round towers) in the period around 1480. In the years 1499 and 1504 was reported by the construction of the outer bailey. In the years 1621 and 1622 Margrave Christian had massive, provided with seven bastions earthen walls around the castle, which were additionally fortified with palisades . However, these precautions did not help much, as in June 1632 imperial troops took the pass from Schirnding, conquered the Hohenberg and occupied it for three years. After the Thirty Years War, Hohenberg Castle lost its strategic importance.
Since 2017, Hohenberg castle has been extensively renovated and used as a youth hostel as well as for meetings.
The castle is surrounded by the ring wall built around 1480 on an irregular hexagonal floor plan, which is additionally attached to the corner points by the gatehouse, three round gun turrets and the square prison tower. A fourth round tower was abandoned in the 19th century. From the medieval interior is nothing left. The so-called princely house was built by Margrave Christian Ernst in 1666 as a town hall and hunting lodge. Other buildings inside the castle were demolished in the 19th century. A remnant of the earthwork from the years 1621/22 has survived.
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.