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Immediately curious about the concentration of castles on the Ghanaian coast. Wonder what that's about.
We just stayed in Dalhousie Castle, the oldest in Scotland. Very beautiful and well maintained, with lots of spooky history.

If you want to leave a legacy, build something out of stone.

Interesting that in Canada Rideau Hall counts, but Casa Loma does not.
Very cool project, but obviously missing (too) many great castles. I'm not sure if that way of measuring popularity is really well done.
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Clicking on full story doesn't do anything. It closes the popup (mobile android)
Invading Australia is looking pretty tempting right now.
Wrong title. Wrong not even by two orders of magnitude.
Is Fort Ross really "Renowned" as listed? I've never heard of it and honestly it doesn't look very interesting. I'd rather visit Fort Knox which is a real fortification currently in use, world famous, and not listed here.
If you submit some map, at least don't have the title contradict the content description:

"the 2,435 most significant landmarks worldwide, ordered by a fame ranking that blends Wikipedia coverage with real readership."

or someone fix the title here please to what on the app right now:

"Map of the world's great castles & fortresses" whatever that means.

Germany's Saxony alone has 700+ fortications with about 100 being touristically interesting. In the map I count like 9.

There are many castles near my parents house in france. I don't see any of them? AI generated?
What's really neat about this isn't just the visualization, but that they’ve packaged the whole dataset as open GeoJSON/CSV mirrored on Hugging Face and GitHub—plus an MCP endpoint for AI agents.
Château de Saint-Cloud, near Paris, reported as "renowned ruin" ??? What a joke! Only the gardens remain.

Even more ridiculous : Bastille also reported as "renowned ruin". Nothing remains. All stones have disappeared centuries ago.

This dataset is bad. The North Carolina state capitol is a castle?
Australia doesn’t have a single castle!
Tangential, but many of these aren't what people traditionally would think of as castles. Is there any consensus on what the "castliest of castles" is? Presumably something in the UK or Ireland or thereabouts considering that's where the popular media conception of them comes from.
I mean, the reason why these dominate in Europe is because largely of the medieval era and a bit before that. Once gunpowder became more widely used, castles became increasingly obsolete. Nowadays they have only touristic value really or movie values, such as the castle in the movie Monty Python and the holy grail. Other than that they are just stone ruins really, some more polished than others. They have no real worth nowadays other than wonder how many resources went into building them.

Also, as others pointed out, the map is missing many castles. I also doubt the spread over China, the map only says about 7 castles in whole China? So that seems totally wrong. The definition for a castle must be incorrect, because Japan has attributed many more and that is simply objectively incorrect. Is the chinese palace classified as a castle? If not, why not? If yes then why not other palaces in China? The map is really not very good here. It should begin by a good definition of what is meant with a castle.

This is not a "map of castles".

I checked my local area, and it omits interesting castles, instead including palaces, landmarks and world war era fortresses.

Shameful submission.