File:Cologne Cathedral, roof construction of wrought iron, from side, 1860.jpg
![File:Cologne Cathedral, roof construction of wrought iron, from side, 1860.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Cologne_Cathedral%2C_roof_construction_of_wrought_iron%2C_from_side%2C_1860.jpg/800px-Cologne_Cathedral%2C_roof_construction_of_wrought_iron%2C_from_side%2C_1860.jpg?20220602150429)
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