Freudenau Castle is a ruined fort in the municipality of Untersiggenthal of the Canton of Aargau in Switzerland. It is a Swiss heritage site of national significance.
Wikipedia https://en.wikipedia.org/wiki/Freudenau_Castle
Address Schlossgartenstrasse, 5301, Switzerland
Coordinates 47°30'44.428" N 8°14'3.177" E
