Lucheux Castle was built in 1120 by Hugh II, Count of Saint-Pol who used techniques taken back from the crusades he had been on. Situated on the border of Artois and Picardy it was one of the most important strongholds in the region. It continued to grow during the Middle Ages. Count Guy III of Saint-Pol altered the castle with four corner towers, hall and chapel in 1275. The castle was attacked by English army during Hundred Years' War several times.
In 1522 the imperial troops of Charles V besieged Lucheux castle for eight days and in 1552 Spanish army attacked it. Protestants took it into their possession in 1567 and the final siege occured in 1594-1595 by Spanish army again. They destoyed the castle and it was finally demolished by the order of cardinal Richelieu in 1640.
Today the massive gate and some walls remain.
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.