Board Thread:Wiki discussion/@comment-31091864-20170209141214/@comment-4812386-20170210035712

That's because the infoboxes on the pages are missing the  parameter. But please don't add the articles directly to places categories, they'll be added automatically if the  parameter is filled in.

I could make a bot add the creation month to all articles about places and make the  parameter required so all place articles would be categorized at least by their creation year...