Jansgeleen Castle, built as House Spaubeek at a bench in the small Geleen river in the 13th century, was the first seat of the former County of Geleen in the 16th century. It got its name Heer Jansgelene after one of the former owners, Lord Jan Rode van Opsinnich in the 15th century, but was later erroneously renamed as Sint Jansgeleen after St. John the Baptist.
The castle, already in a bad shape at the end of the 19th century, and further damaged by the mine galleries of the nearby big Maurits mine at Geleen in the 1920s, was finally demolished in the 1930s. Only the buildings of the water mill (Jansmolen) and the forecourt (16th century) have remained, now both provincial monuments.
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.