Medieval castle ruins, Castle ruins in Wildberg, Switzerland

Ruine Tössegg is a castle ruin in Wildberg with stone walls positioned on higher ground that reveal how medieval fortifications were constructed. Visible foundation remnants and masonry sections show the layout and building methods of the original structure.

The small castle was probably built in the first decades of the 13th century and served as the seat of the Meier von Turbenthal, mentioned in 1266. From 1363 to 1410 it belonged to the Lords of Wildberg, one of the four castles of the 'Edlen von Wildberg'. After their ancestral castle in Wildberg burned down, they bought Tössegg from relatives in the Töss Valley. Later used as a quarry during factory construction in the Töss Valley, the moat was filled in for agricultural purposes.

The castle gave its name to a branch of the Lords of Wildberg, who called themselves "von Tössegg" in the village of Wildberg. It was one of four castles held by these nobles. The site is now a class B Swiss cultural property of regional significance.

The ruins are accessible from Wildberg via marked paths that branch from the main road. Sturdy walking shoes are recommended as the terrain is hilly and partly unpaved.

The castle was used as a quarry during factory construction in the Töss Valley, and its moat was later filled in for farming. A branch of the Lords of Wildberg even called itself "von Tössegg" after the castle.