alt Hacker NewsNot sure if they count, but the site appears to be missing loads of British star-forts built around the great lakes, st. lawrence, and eastern Canada!
https://en.wikipedia.org/wiki/Citadel_Hill_(Fort_George)
https://en.wikipedia.org/wiki/Georges_Island_(Nova_Scotia)
https://en.wikipedia.org/wiki/Citadelle_of_Quebec
https://en.wikipedia.org/wiki/Old_Fort_Erie
https://en.wikipedia.org/wiki/Fort_Anne
They built these things _everywhere_, probably a good part of what bankrupted the British Empire!
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It’s missing the extensive Napoleonic-era Western Fortifications on the opposite side of Dover from the much more famous Dover Castle.
https://en.wikipedia.org/wiki/Dover_Western_Heights
But to be fair they’re much less well known, and quite well concealed, and are partly on private land, with big fences, cameras and scary warning signs. Tourists don’t seem to be much interested in post-medieval fortifications.
I imagine they only downloaded whatever was tagged as "castle" in wikidata. Compare these two:
Bran Castle: https://www.wikidata.org/wiki/Q390275
Citadel Hill: https://www.wikidata.org/wiki/Q321867