castle | Windsor Castle | Castle | Landgraviate of Hesse-Darmstadt | Edinburgh Castle | Balmoral Castle | Castle (TV series) | Butzbach | Prague Castle | Landgraviate of Hesse-Kassel | Castle Donington | Corfe Castle | Castle Hill | Castle Hill, New South Wales | Powis Castle | Roy Castle | Colditz Castle | Castle Combe | New Castle | Nagoya Castle | Dublin Castle | New Castle, Delaware | Lancaster Castle | Hearst Castle | Harold & Kumar Go to White Castle | Cardiff Castle | The Castle of Otranto | Tantallon Castle | Takeshi's Castle | Luttrellstown Castle |
For astronomical studies, he built an observatory in his Landgraviate Castle in Butzbach and had some astronomical instruments made.