The Fortress can be visited
Nauders Fortresss

The Nauders Fortress, also known as the Nauders Roadblock or Hochfinstermünz Barrier, is a structure in North Tyrol, Austria. It was strategically positioned in a gorge.
History+
The Nauders Fortress was built between 1834 and 1840 on the site of an older defensive wall. It is the oldest continuously manned fortification on Austrian territory during World War I. The planning of the construction was carried out under Field Marshal Lieutenant Franz Scholl, while Major General Georg Eberle served as the responsible engineer. The inscription FRANCISCUS I. 1834. FERDINANDUS I. 1840. on the north-facing gable commemorates the two emperors under whose rule the fortress was erected. After World War II, the facility served as a depot for the French occupation forces before being abandoned as a military object by the Austrian Armed Forces in 1970.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Festung_Nauders.jpg?uselang=de
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 46.9132, 10.4932