Richmond Castle is a castle built from 1768 to 1769 in Braunschweig, Germany for Princess Augusta, wife of Karl Wilhelm Ferdinand. It lies near the Oker river in the south of the city. The architect was Carl Christoph Wilhelm Fleischer.
The castle was named after the princess's English home in Richmond Park, a royal park now in the London Borough of Richmond upon Thames.
Wikipedia https://en.wikipedia.org/wiki/Schloss_Richmond
Coordinates 52°14'24.252" N 10°31'36.273" E