Don't forget the Tu-144 "Concordski"
It isn't exactly accurate to say the Concorde was the only supersonic airliner. There was the Tu-144. The Concorde was certainly the most successful supersonic airliner, at least from a technical and operational perspective. Neither plane was successful from a financial perspective.
An Air France Concorde will be part of the new collection at the Smithsonian Air & Space Museum when the new building opens next month. It looks like one is on display in New York at the Intrepid Museum. Those two, along with the one in Seattle, are the only ones I know about in the United States.