The history of Bennebols Ironworks started in 1683, when Gustaf Otto Stenbock built there a blast furnace.A small ironworks village grew up to one of Uppland's many Walloon ironworks villages. Iron production ceased in 1884, but the village environment lives on, with a bailiff's residence that includes the ironworks office in one of the wings, a schoolhouse, a row of stables, remains of a charcoal house, a blast furnace, a roasting oven, and a town street lined with residences and barns.
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.