A Giant Ground Sloth at the Smithsonian National Museum of Natural History in Washington DC. They could reach up to 20 feet in length although this one is *only* 13 feet tall. Museum Monday is an every other week series about museum news, objects, and reviews. Related posts: Museum Monday: Triceratops Horridus at the Smithsonian Museum Monday: Amelia’s Vega Museum Monday: Archaeopteryx Museum Monday: What Lies Beneath the Smithsonian Souvenir Saturday: Bismuth