Is there any way to disable razing cities for a scenario/ or with a particular advance that disables...

I find it funny when large cities with millions of people are razed in the modern era with no diplomatic penalty... similar to nukes, but without the penalty... I would think there would be a rather large diplomatic penalty for razing say Berlin, Paris, or Tokyo to the ground...

Just a thought

I agree entirely. I don't think there is currently any way to do this, but I really think the diplomacy system, being so enhanced, really lacks in the atrocities department. Maybe in a patch... Probably not though.