Ruine Freienstein, Medieval castle ruin in Freienstein-Teufen, Switzerland
Ruine Freienstein is a medieval castle standing on a hillside above vineyards at 460 meters elevation, with remaining walls and structural elements still visible today. The site shows the layout and features that were typical of castles built during that period.
Built around 1250 by a noble from Tengen, the castle changed hands several times before troops from Winterthur destroyed it by fire in 1443. This event marked the end of the structure as a functioning fortress.
The ruins represent how medieval builders constructed defensive structures using techniques common across this region. You can observe the stonework and layout that reflects defensive principles of that era.
The ruin sits at 460 m on a hill above a vineyard in Freienstein-Teufen. The site was conserved in 1976 and is protected as a federal monument; the tower area and the filled-in Sodbrunnen west of it are the main points to find. Sturdy shoes help on the climb.
West of the tower lies a well shaft discovered in 1968 and fully excavated in 1981/82. Its builders drove a shaft 2.30 by 2.40 metres wide and 26.40 metres deep into the molasse rock; tuff blocks at 10 and 15 metres show it was masonry-lined up to the tower base, giving a total depth of 33.5 metres.
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