In DC

At the National Museum of the American Indian, an exhibit made a big point of how the original inhabitants of our fair continent did not call themselves Indians or Americans or anything like that.  So there were quotes from some guy and at the end it said "nmai" and I thought "oh, maybe that's what they call themselves, like the gypsies call themselves Roma." So I Googled it, and it turns out that NMAI stands for
... National Museum of the American Indian.