Mammertshofen Castle is a castle in the municipality of Roggwil of the Canton of Thurgau in Switzerland. It is a Swiss heritage site of national significance.
Wikipedia https://en.wikipedia.org/wiki/Mammertshofen_Castle
Official Website https://www.roggwil-tg.ch/index.php?show=88
Coordinates 47°29'40.494" N 9°23'53.809" E
