Unterer Donauturm (Werk XXV)
The Unterer Donauturm (Werk XXV) stands in Ulm, Germany, beside the Danube as part of the city’s historic fortifications. Its thick walls and elevated position reflect nineteenth-century military architecture. Built between 1845 and 1855, the defensive tower formed part of the Bundesfestung Ulm. Engineer Major von Völker designed the tower for this strategic river position.
The fortification helped control Danube traffic and connected with the Untere Donaubastion and Untere Stadtkehle. A wall once linked these structures. That wall has since disappeared, while the tower remains largely in its original form and now hosts youth and cultural activities through Jugend und Kulturplattform Donauturm e.V. During conflict, a massive iron chain could stretch across the Danube to block advancing ships.
- City
- Ulm
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Take this page with you
The myTuur app is free, and once you are standing at a spot its story starts by itself.
Spots like this one are the stops myTuur strings into tours through Ulm. In the app, each story begins where you stand: walk up to a spot and it starts, read it on screen or listen as you go, then follow the route to the next one.
What is myTuur?
myTuur is a free city-guide app. Its tours are built from spots, and each spot carries a story that starts when you get there, to read or to listen to as you like.



