Untere Gaisenbergbastion (Werk XXI)
The Untere Gaisenbergbastion (Werk XXI) stands in Ulm, Germany, within the eastern fortifications of the Bundesfestung Ulm. Built between 1843 and 1858, it guarded the eastern flank of Michelsberg. Designed as a closed bastion, the work enclosed a four-sided wall, mortar batteries, a bonnet casemate, and a dry moat.
Captain Vogt supervised construction, which formed part of the nineteenth-century fortress built by the German Confederation. Earth coverings were added in 1880, and the reduit was raised in 1896. Its defensive layout included a double caponniere on the right flank, large barracks in the gorge, an escarpment, and a glacis. Much of the original structure later gave way to the University of Ulm, leaving the front escarpment and bonnet casemate.
The surviving caponniere houses a student café and a local cultural club. The right flank serves a community centre, while the surrounding area belongs to the University of Ulm campus. Live music in the historic caponniere places a contemporary scene inside a military structure.
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- Ulm
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