Niederalfingen Castle, also called the Marienburg, is a spur castle on a rocky hill spur above the Kocher valley. The castle was built around 1050 as a Hohenstaufen fortification to guard the important local trade routes. After 1300, it went into the possession of the Lord of Seckendorf, in 1368 to Count Eberhard the Jarrer of Württemberg, in 1415 to the Lord of House of Hürnheim and in 1551 the now mighty castle was acquired by the Fugger family from Augsburg, by whom it was converted and expanded between 1575 and 1577.
In 1838, the castle came into the ownership of the Kingdom of Württemberg. It eventually passed to the state and, since 1966, has been used as an educational and recreational facility. From 1993 to 2000 comprehensive renovations were carried out.
The castle is used today as a youth training centre, recreational facility and rural school hall of residence (Schullandheim). The former advocate's buildings under the castle walls now house the local history museum for the parish of Hüttlingen.
The site, which developed from a zwinger castle with a gateway, has an inner bailey with connecting wings, an outer bailey and substantial enceinte walls. It also has a prominent 30-metre-high bergfried, with a copper tower, an area of 9.8 × 9.8 metres and wall thickness of 3.2 metres, which is square below and hexagonal above, furnished with embrasures. The castle chapel was dedicated to St Mary, St. Barbara and St. Catharine. The feudal castle is and example of the Romanticism of the 16th century.
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.