Fort Hartmühl
Fort Hartmühl stands on the northern edge of Hartenberg in Mainz, where the former fortress city watched over the Gonsbachtal. Its surviving walls now lie within Hartenberg Park, north of the water features near the grill hut.
Austrian pioneers built the fort between 1826 and 1831 under Franz von Scholl, linking it to Fort Hartenberg with a 300-metre structure for troop movements. Much of the complex disappeared after the Treaty of Versailles, while the remaining ruins became part of an 18-hectare park shaped by both nature and military history. The post-war nickname “Eierburg” stayed with the remains until most of them were buried during the 1970s.
The site preserves a tangible fragment of Mainz’s northern defences, with old masonry set among park paths and trees. From the Hartenberg position, the fort once helped protect northern Rheinhessen and the city’s Neustadt.
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- Mainz
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