Homburg or Neu-Homburg Castle was the seat of the Froberg family since the 13th century until it was destroyed in 1798. Count Hermann IV of Frohburg settled in 1240 in the Läufelfingen valley. The castle was built by Hermann. The Bishop of Basel acquired Homburg in 1303 and built a new castle with the mighty residential tower as the seat of his Vogts.
After the French Revolution, many of the rural people rebelled against the Basel government. During the night of 23rd to 24th January 1798 Homburg was burnt down. Later the ruin was auctioned for use as a quarry.
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.