In the heart of the Septmonts village lies the remains of the Château de Septmonts, of which the principal remains are of the 14th century donjon or keep. The castle was the country seat of the Bishop of Soissons, probably since the last half of the 12th century and was first built in stone a little before 1242.
Thought to have been inspired by the works of Charles V of France, the 43 metre tall donjon, exemplifies the princely style of the late 14th century, combining both military and residential function. The donjon is currently undergoing a programme of restoration.
References: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.