Rupelmonde Castle was built by the Counts of Flanders in the 12th century directly opposite the mouth of the river Rupel into the Scheldt river to defend these rivers. It was a large fortress with 17 towers circled by a moat. From this castle toll was levied from passing ships. Later on the castle was also used as a state prison. This caused the castle to play a important role in the history of the region.
In 1678, when Spanish and Dutch troops were fighting against French troops, the castle was destroyed. The castle was never rebuilt and turned into a quarry for cheap building materials for the locals. In 1817 the castle ruins were demolished with exception of a base of a tower with some connecting wall fragments. On these remains then a tower out of red Tournai limestone was built by Baron De Feltz. This tower was used as a hunting pavilion.
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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.