“Snooty” recommendations?

I don’t really know how to phrase this better, but my mother in law is coming to visit and she is very “snooty”. She really likes to have unique and fancy experiences that she can go home and brag about. Since the last time she’s visited, we’ve seen every Smithsonian museum and the museums around the mall. We’ve also visited the Congressional library, White House, Capitol, and the museum of the Marine Corp. I’m trying to get recommendations on things to do with her while she’s here that are unique and brag worthy (and I’m willing to drive to areas outside of NOVA if needed) . Any recommendations you can give me would be SO greatly appreciated. TYIA.