Sesame Street: The First 20 Years is a Sesame Street exhibition at the Smithsonian National Museum of American History that ran from June 20 - October 15, 1989. Celebrating the show's 20th anniversary, the exhibition features elements of the Sesame Street set (the Hooper's Store facade and the signature lamppost and street sign), posers of the Muppet characters (Big Bird, Oscar the Grouch and Slimey) and other props and production materials (such as Rubber Duckie, animation cels and storyboards).