Religious Sites - Is it Taboo?

I was wondering about the status of making important religious sites - Like the Vatican, Mecca, and Jerusalem. I would think it is okay to do it, but after reading some wiki talk pages about it, I am not so sure anymore.
It would be great to see a place like that somewhere in OGF.

I plan on creating one of the above if I can indeed create one of those places.

Thanks,
Zekiel