Huis Doorn is a manor house and national museum displaying the early 20th-century interior from the time when former German Emperor Wilhelm II lived in the house. The first house was built in the 9th century, but it was destroyed and rebuilt in the 14th century. It was again rebuilt in the late 18th century in a conservative manner and, in the mid-19th century, a surrounding park was laid out as an English landscape garden.
The gardens were also created in the 19th century. After World War I, Wilhelm II bought house, where he lived in exile from 1920 until his death in 1941. He is buried in a mausoleum in the gardens. After the German occupation in World War II, the house was seized by the Dutch government as hostile property.
Huis Doorn is now a national museum and a national heritage site. The interior of the house has not been changed since Wilhelm II died. Every year in June, German monarchists come to Doorn to pay their respects to the emperor.
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The Château d'Olhain is probably the most famous castle of the Artois region. It is located in the middle of a lake which reflects its picturesque towers and curtain walls. It was also a major stronghold for the Artois in medieval times and testimony to the power of the Olhain family, first mentioned from the 12th century.
The existence of the castle was known early in the 13th century, but the present construction is largely the work of Jean de Nielles, who married Marie d’Olhain at the end of the 15th century.
The marriage of Alix Nielles to Jean de Berghes, Grand Veneur de France (master of hounds) to the King, meant the castle passed to this family, who kept it for more than 450 years. Once confiscated by Charles Quint, it suffered during the wars that ravaged the Artois. Besieged in 1641 by the French, it was partly demolished by the Spaniards in 1654, and finally blown-up and taken by the Dutch in 1710. Restored in 1830, it was abandoned after 1870, and sold by the last Prince of Berghes in 1900. There is also evidence that one of the castles occupants was related to Charles de Batz-Castelmore d'Artagnan, the person Alexandre Dumas based his Three Musketeers charictor d'Artagnan on.
During the World War I and World War II, the castle was requisitioned first by French troops, then Canadian and British soldiers. The current owner has restored the castle to its former glory.