Rudenz Castle is a ruined castle atop a hill in the municipality of Giswil in the canton of Obwalden in Switzerland. The castle and surroundings are a Swiss heritage site of national significance.
Wikipedia https://en.wikipedia.org/wiki/Rudenz_Castle_(Obwalden)
Address 3 Burgrainli, Giswil 6074, Switzerland
Coordinates 46°49'56.695" N 8°11'3.974" E