St. Mary's Church was built from 1247–1343 and is one of the most distinct Gothic buildings in Swabia. Between the 1520s and 1540s the church was a center of the Swabian reformer Matthäus Alber, who spread the teachings of Martin Luther to Reutlingen and surrounding areas. The church was heavily damaged during a fire in 1726. From 1893-1901 it was rebuilt in Neo-Gothic style. On the 71-meter high west tower shines a gilded angel from 1343.
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.