Gliwice Iron Bridge (Poland)
This cast iron arch bridge was built in 1804 across the old Kłodnicki Canal in Gliwice (Silesia).
The span was 8.08 m, and the clearance under the bridge was 6.74 m.
The bridge was dismantled in 1936, but fortunately the main girders were saved, and are on display in Gliwice.
For more information, with illustrations, see here [1]