I do add some monuments. For Japanese stones, I'm a little more conservative about adding them, generally. I'll be adding the Hida no Sato stones to the map alongside the article though.

As for Benelux, I'm not aware of any historic stones. There is one person who set up a stonelifting challenge in Belgium. Feel free to email me (via the contact email on the site) and I can share more info if you want it.