Open APIs Löydä kaikki pääkaupunkiseudun avoimet rajapinnat täältä! Submit Last created Popular Relevance Names in ascending order Names in descending order Last modified Go 1 dataset found Historical detailed plan maps of the city of Helsinki Old detailed plans of Helsinki. The detailed plan maps for years 1820, 1838 and 1878 can be downloaded as TIFF-files. The guidemaps for all years can be found through WMS API.... TIFF WMS