Cub Scouts View the Stegosaurus, by Unknown, c. early 1950s, Smithsonian Archives - History Div, A group of Cub Scouts are being shown the skeleton of a Stegosaurus dinosaur, which is part of the Paleontology Exhibition in the United States National Museum's (USNM) Natural History Building (NHB), now known as the National Museum of Natural History (NMNH). At the time of this picture, the exhibit was called the "Hall of Extinct Monsters." Behind the skeleton of the stegosaurus is a papier-mache model of the stegosaurus..