In Estonia we are slowly importing data about every painting in a museum collection in the country. Thanks to the fact that all public museums share a database, MuIS, it’s at least doable to use the same process to import almost all of them (although the quality of the data itself does vary a lot depending on the museum). In the future we might want to expand this to other kinds of artworks (such as sculptures).
We recently imported coordinates and addresses for every library in the country (the data had been compiled by people at the National Library but it wasn’t really being used anywhere publicly as far as we know). In 2020 we plan to do the same for museums, schools and kindergartens.
We’re trying to find a good source with a compatible license for lexeme importing (or to convince one of the main dictionaries to change their already pretty open CC-BY license to CC0).
I’d love to import election data, but I’m not quite sure of its licensing nor of the Wikidata guidelines for notability with regard to elections (I know people who got elected to the national parliament are notable, but what about people who stood but did not get elected, or about people elected to a small municipality’s council?) :)