Schneppenbach was administratively tightly bound with the Schmidtburg castle, which nowadays stands within the village's municipal limits. The castle, whose beginnings go back at least as far as 929, and possibly as far as 926, is one of the oldest in the Nahe-Hunsrück region and is believed to have been the family seat of the Counts in the Nahegau, the Emichones. Their coheirs and rightful successors, the Waldgraves, owned the castle in the 12th and 13th centuries. Internal Waldgravial family disputes, however, resulted in ownership being transferred about 1330 to Archbishop and Elector of Trier Baldwin of Luxembourg. Under Baldwin, the castle was expanded, and in the time that followed, it became the seat of the Electoral-Trier Amt of Schmidtburg.
The castle was destroyed during the War of the Grand Alliance (1688–1697) by French troops in 1688. Today impressive large ruins remain.
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.