Le Rœulx Castle, also known as the Château des Princes de Croÿ, is family seat of the Comtes de Croÿ-Rœulx. The origins of the castle date to a fortified structure from the 11th century. It was redeveloped in the 16th century by Adrien de Croÿ and most of the castle was destroyed in the middle of the same century. Views from the very beginning of the 17th century show a house made up of a main accommodation section and two towers that are radically different from the current castle, which is the result of conversion works carried out in the second half of the 18th century.
The building itself, which evokes a certain French-style classicism, mixes both sources of local inspiration (a mixture of brick and stone) and also the Germanic (tending towards the horizontal). The result is a U-shape consisting of a main wing and side wings enclosing a main courtyard. The junction between these wings and the façade is unusual as a result of the convex structures placed in the corner. The central section of the building, which has a frontage with balcony and dome in the centre of a symmetrical composition, houses a vestibule displaying some traces of the previous building, as well as a majestic and profusely decorated main staircase, as well as the stairwell lit by the skylight, with décor in Rocaille style. Finally, the remarkable main drawing room is exquisite testament to the decorative style of the 18th century.
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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.