Lisa, the first floor women's restroom at the Museum of American History still has the bathroom history exhibit (if you call a couple of paragraphs, several illustrations, and a length of pipe an exhibit). Don't ask me how I know. Unfortunately, the corresponding display in the men's room was removed some time ago. I believe the bathroom displays were a brainstorm of Daniel Boorstin when he was director, which would date them to the late 1970s. I never thought this idea was carried far enough, but I imagine there might have been a fear that a more extensive exhibition would have interfered with traffic flow (pardon the expression). But I was never PRIVY to this project, so I can only guess. --David Haberstich