The Leitha was a river monitor built for the Austro-Hungarian Navy in the early 1870s. She served in WW1 and was subsequently converted into an elevator ship and worked as such until 1992. In 2005-2010 she was restored to her former glory, and is now a museum ship in Budapest, Hungary.
Unfortunately, she was closed for the winter when I was there, so I couldn’t get onboard, however she is still an impressive sight.
Links and References:
George, A, 2016, SMS Leitha: A Survivor of the Austro-Hungarian Navy, Warship World, 14 (9), pp26-27.