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are underground enclaves which are situated up to 15m beneath the castle. They were once used to store wine and beer and during the Second World War, many precious works of art were hidden here. They can only be viewed as part of a tour, which usually ends in the Alststadthof
, a small square with shops and the city's smallest brewery. The beer that is made here is unfiltered and the method used has been the same for over 100 years.