Freudenau castle ruin

The Freudenau castle ruin is located near Untersiggenthal in the canton of Aargau — not in Zürich as the slug suggests — and is classified as a Swiss cultural property of national importance (Class A). Little is documented in publicly available sources about the castle's founding or history, though its remains point to medieval origins. What survives today are fragmentary walls set into the Aare valley landscape, a quiet remnant of the region's medieval fortification heritage.