The remains of the fortress can be visited
FortressSchottwien
Schottwien Fortress

In 1094, the place was still referred to as "Clamme", and in 1220 it was first mentioned in a document as Schadwin. In the following centuries, this market was a strategically important fortification point and also a toll station.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/noe/niederoesterreich.html
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Location: 47.6528, 15.8705