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In 1952 Troisdorf became a free city, in 1969 the urban area got extended with the township of Sieglar and the villages Altenrath and Friedrich-Wilhelms.

The picture book museum Burg Wissem in Troisdorf offers a broad collection of picture book illustrations, old and modern picture books and artist books. Situated between Cologne and Bonn it's the only museum in Europe collecting and regularly exhibiting picture book art for children and adults.

The museum was established in 1982, taking over the “Foundation Wilhelm Alsleben”. Mr. Alsleben, a businessman, collector and citizen of Troisdorf assigned around 300 drawings for picture books, litho stones and other printing plates, and some thousand books to the new museum.

In the following years the collection was systematically enlarged by acquisitions and donations. Today they can present extensive and manifold collections in a series of attractive exhibitions.

The castle Burg Wissem was erected between 1500 and 1850. The manor house was built around 1840 in classicistic style, probably using old building material. Painted bright red, the house is flanked by two towers. In 1939 it became property of the City of Troisdorf and was used as a town-hall between 1945 und 1981. Since 1982 Burg Wissem has been the home of the picture book museum. In direct vicinity of the "new" manor house you can see the so-called "Remise" or coach-house. A long rectangular building with two floors, erected around 1550. On the front of the building you can see the coat of arms of the former owners Kaspar von Zweifel and his wife Elisabeth von Lutzerode. Originally the manor house, in later times it became the coach-house. In 1992 the "Remise" was reconstructed and is now part of the museum, but is also used for concerts and other cultural events. Manor house and coach-house are connected by a copy of the "Lenin platform", designed by El Lissitzky in the 1920s.