Cappenberg Castle is a former Premonstratensian monastery, Cappenberg Abbey in Cappenberg, a part of Selm, North Rhine-Westphalia in Germany. It stands on an elevation, the Cappenberg, near Lünen and Werne, and is a vantage point offering views over the eastern Ruhrgebiet.

Heinrich Friedrich Karl vom und zum Stein, commonly known as Baron vom Stein, was a Prussian statesman who introduced the Prussian reforms, which paved the way for the unification of Germany. He promoted the abolition of serfdom, with indemnification to territorial lords; subjection of the nobles to manorial imposts; and the establishment of a modern municipal system.