Trostburg Castle

Teufenthal, Switzerland, Switzerland

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Trostburg Castle is a small, partially preserved medieval fortress in the municipality of Teufenthal, canton of Aargau, Switzerland, likely constructed in the 12th century as the ancestral seat of the Trostburg knights.

It passed through noble lines including the Kyburgs, Habsburgs, Lords of Rinach, and Hallwils, who expanded it with a chapel and residence hall before Bernese authorities acquired and repurposed it in the 15th-17th centuries amid regional conquests.

Falling into ruin by the 18th century, it later hosted a music box factory and partial 20th-century rebuilds, with 1999 archaeological work stabilizing walls that now mark it as a cultural heritage site accessible via local trails.