Unterhof Castle

Diessenhofen, Switzerland, Switzerland

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Unterhof Castle is a medieval fortress in the historic town of Diessenhofen, Canton of Thurgau, Switzerland, first documented in 1185 as the seat of the stewards of Diessenhofen, with its oldest timbers dendro-dated to 1186 and prehistoric settlements on the site dating back to the Neolithic era around 4000 BC.

It served as a noble residence for the Truchsessen family from 1294, later pledged to the city in the 15th century amid shifting Habsburg and Swiss Confederate control, evolving from a defensive burg into part of the town's skyline alongside walls and the Rhine.

Recognized as a Swiss heritage site of national significance, the castle complex stands as a landmark within Diessenhofen's preserved medieval old town, now integrated into local tourism near the Rhine bridge and hosting exhibits of its archaeological finds.