In La Ferté-Milon stand the ruins of an unfinished castle, whose façade was 200 m long and 38 m high. The first castle was erected already in the 9th century AD, but the current structure dates from 1393, when Louis of Orléans started to reconstruct a strong castle. It was cancelled in 1407, when Louis was assassinated.
The singular form of the tower walls was probably designed to resist cannons and protect the gate. The façade is preceded by a moat. On the right is a square tower of which two bare walls remain. The top of the ramparts is adorned with machicolation. Access to the town was protected by a former gate of which two towers remain. Behind the ramparts, two 160 mm cannons from 1909 sit facing towards the valley.
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.