The City Wall can be visited
Town Fortification Zwettl

In the 12th century, Bavarian settlers, led by the Kuenringer, advanced deep into the Waldviertel. They built a castle on a hill above the confluence of the Kamp and Zwettl rivers. At its foot, the settlement of Zwettl emerged, first mentioned in a document in 1139.
Source: wehrbauten.at · Image: http://commons.wikimedia.org/wiki/File:Kesselbodenturm_%28fr%C3%BCher_Sattigturm%29_und_Stadtmauer_in_Zwettl.jpg?uselang=de
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Location: 48.6079, 15.1671