Schadeck Castle is a counter-castle which was built in opposition to the nearby Runkel Castle. It stands above the River Lahn in the eponymous parish in the county of Limburg-Weilburg in the German state of Hesse.
Wikipedia https://en.wikipedia.org/wiki/Schadeck_Castle
Address 30 Schloßstraße, Runkel 65594, Germany
Coordinates 50°24'29.676" N 8°9'20.355" E