Schlettau Castle dates probably from the 13th century. In the 14th century the castle was extended to a Gothic-style castle palace by the Schönburg-Crimmitschau family.
From 1413 to 1536 Schlettau belonged to the Cistercians. After the secularization in 1536 it became the property of the Saxon Electors, who used it as a hunting lodge. The still existing stuctures consist of a Renaissance section (about 1620) and two Baroque wings (early 18th century). Today it is restored and hosts a museum.
Kakesbeck is one of the largest medieval fortifications in Münsterland and the oldest castle in Lüdinghausen. The imposingly grown complex originated in 1120 as a motte, a small hilltop tower castle. After numerous changes of ownership, the castle was extended onto two islands, but it was not until the 14th century that it underwent significant alterations and extensions under the von Oer family. The estate experienced its heyday in the middle of the 18th century, when it covered an area of almost one square kilometre and consisted of five further outer castles in addition to the core castle, which were secured by ramparts and moats.
The well-maintained condition of the castle today is thanks to the late Wilfried Grewing, the former lord of the castle. The foundation named after him has been particularly committed to preserving the property since 2020.