Fort Joseph, Military fort in Mainz, Germany.
Fort Joseph features extensive underground passages stretching over two kilometers, with large vaulted chambers and observation tunnels throughout the structure.
Built between 1713 and 1730 under architect Johann Maximilian von Welsch, the fort strengthened Mainz's defenses after French occupation ended in 1689.
The fort houses a memorial erected in 1934, displaying a stone cannon and Prussian eagle to commemorate the fallen soldiers of Artillery Regiment 3.
The temperature inside maintains 14 degrees Celsius year-round, with guided tours providing helmets and flashlights for underground exploration.
The counterscarp corridor contains shooting ports and powder extraction holes, constructed above ground before being covered with earth.
Location: Mainz
GPS coordinates: 49.99530,8.25639
Latest update: March 2, 2025 23:11
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