I don't see that as the prereq for being a national wonder. NW's can be used to specialize a city in the empire to give it something no other city in the land can get that is an abnormally high modifier for a normal building. (+25% research for example shouldn't be available in every city.) No but only one Smithsonian, for example. This is why I say it should have a more compelling name (though one that is generic enough that every player can get one.) These are just my counterpoints. Interesting arguments made. Anything I need to address has been in a holding pattern to a degree as it's been a while since I've coded. I've decided I want to address it soon though. Within the next week I'm hoping.