Wittgenstein Castle (Roisdorf)

Haus Wittgenstein is a villa near Ehrental on the slope of the Metternichsberg (on the site of a medieval hilltop castle of the Metternich family), built in 1844/45 by cathedral architect Ernst Friedrich Zwirner for the Cologne entrepreneur Heinrich von Wittgenstein. In the mid-1950s, a Kneipp sanatorium (later also a neurological clinic) was established here, and from 1984 to 1995, it served as a conference center for the party "Bündnis 90 / Die Grünen" (at times also its federal headquarters). Since 1996, the building has been the seat of a free church community, the International Center for World Mission.