Altes Wasserwerk, Gothic Revival architectural monument in Gronau, Bonn, Germany.
The Altes Wasserwerk is a building in the Gronau district that originally served water supply functions and was later repurposed. The structure displays pointed arches, steep rooflines, and decorative details reflecting 19th-century Gothic Revival design.
The waterworks was established in 1873 by the Rhine Waterworks Company and supplied Bonn with water until 1958. The city then took over the building and transformed it into a modern office complex.
The building's name reflects its origins as a water supply facility that once served Bonn, and it now demonstrates how industrial spaces can transform into modern office complexes. Its Gothic Revival features remind visitors of 19th-century craftsmanship and shape the character of the UN Campus today.
The site is part of the UN Campus and located at Hermann-Ehlers-Strasse 29, where it functions as office and conference space today. Visitors should note that it remains an active administrative building, so access may be limited.
The original machinery room and boiler house remain intact, displaying industrial equipment from the waterworks era. These preserved components offer a rare glimpse into the technical processes of the late 19th century.
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