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LocationRuine Frohberg or "Tschöpperli", Aesch, Basel Land (CH)GPS coordinates: 47°28'4", 7°33'43", 450m above sea level First mentioned in 1292. Build by the family Schaler from Basel and likely never completed. In close proximity to the Castle of Schalberg, owned by the same family. 1356 damaged by the big earthquake of Basel and abandoned.
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