The claim that the Wall is 300 miles long is further supported in Game of Thrones: A Telltale Games Series, where Britt Warrick says to Gared Tuttle a 300-mile wall, and you're still in my way. The game is canon to the show so it is possible that Sam was wrong.
One of the most respected collections of museums in the world, the Smithsonian Institute is an inspiring attraction for kids, teens and adults. Comprised of 19 different museums, art galleries and research centers, the Smithsonian collection is centered around the National Mall - and admission is always free. The most popular Smithsonian museums include the National Archives, National Zoo, National Museum of Natural History and the National Air and Space Museum.
Since the completion of the Arts and Industries Building, the Smithsonian has expanded to twenty separate museums with roughly 137 million objects in their collections, including works of art, natural specimens, and cultural artifacts. The Smithsonian museums are visited by over 25 million people every year. The Smithsonian Institution announced in January 2015 that it is in talks to build its first permanent overseas exhibition space within London 's Queen Elizabeth II Olympic Park.