The City Wall can be visited
Town FortificationHainburg an der Donau
Hainburg City Wall

With its 2.5 km long city wall, three preserved gates, and 15 towers from the 13th century, Hainburg possesses one of the oldest and best-preserved city fortifications in Europe. The first written mention of Hainburg occurred in the Nibelungenlied in connection with Rüdiger von Bechelaren.
Source: wehrbauten.at · Image: http://commons.wikimedia.org/wiki/File:HainburgFischertor.jpg
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Location: 48.1456, 16.9478