Should D.C. be no-fee?

One of the nicest things about visiting Washington, D.C. is that so many museums and attractions are free thanks to a generous government. But is that really such a good thing? Yes, American citizens should have free access to the institutions supported by their taxes. But should the hordes of foreign visitors also get free admission? It's not like we can tour their museums gratis. And how deeply do these visitors and their children really appreciate our treasures and artifacts when viewing them requires nothing more than showing up? Wouldn't we be likely to have fewer crowds and far more appreciative attendees if we required some kind of admission fee from those who are not citizens? I think we would. It would also give us more funds to maintain and constantly improve these facilities. As Americans we are very proud of our nation's capital. But as it becomes more and more popular with tourists, it becomes increasing costly to maintain, considering the human traffic that takes it toll on every open-to-the-public building. I think it's time that Uncle Sam stopped picking up the enormous tab for foreign visitors touring our capital and requested some of their capital in return.