The remains of the Castle can be visited
CastleNeustadtl an der Donau-Freyenstein
Freienstein Castle

Around the year 1000, the area around Ybbs and Freienstein was owned by the Counts of Ebersberg. A forged document from 1037 indicates that the Ebersbergers had soon handed Freienstein over to the Geisenfeld monastery they founded. However, under the last Babenbergs, the castle was already princely property.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/noe/niederoesterreich.html
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Location: 48.2087, 14.9517