[guyzero]

Interesting that in Canada Rideau Hall counts, but Casa Loma does not.

[etimberg]

I see Casa Loma in there now, but if that counts I'd expect something like https://en.wikipedia.org/wiki/Boldt_Castle to also count

[pluc]

or Chateau Frontenac in Quebec? What's the criteria for being a castle?

https://en.wikipedia.org/wiki/Ch%C3%A2teau_Frontenac

[weezing]

They use a crappy model I guess. This reeks AI.