"The Mannheim Observatory was a tower observatory built between 1772 and 1774 in Mannheim, Germany, which remained in operation until 1880. The observatory was transferred to ...
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Karlsruhe and finally in 1898, was established on the Königstuhl near Heidelberg where today´s successor institution the State Observatory Heidelberg-Königstuhl is located.
The observatory tower is now owned by the city and was restored in 1905–1906, and after the Second World War. Since 1958, the tower houses studio flats." - (en.wikipedia.org 30.01.2020)