The ruins of Benzigen Castle lie on a terrace north of Schwanden, which slopes steeply towards the Linth. The two-part complex consisted of a spacious outer bailey and a slightly higher, large tower made of megalithic masonry. A 16-meter-long section of the latter's wall still remains today. This was probably the residence of the Knights of Schwanden, who appear several times in documents in the 13th century.