Redwood Tree House The Redwood Tree House stood on the <a href="http://mallhistory.org/items/show/324">grounds of the US Department of Agriculture</a> for 38 years, between 1894 and 1932. Harvested in California, it had been displayed at the 1893 World's Columbian Exposition in Chicago before coming to Washington. The giant Redwood stood 26 feet across and 36 feet high, and as a tree house, it contained a staircase and a viewing platform at the top. Visitors to the Mall could climb the staircase to enjoy the view. National Archives at College Park. <a href="http://research.archives.gov/description/512818">View original</a>. 1894 (Installed) 1932 (Removed) <a href="/items/browse?advanced%5B0%5D%5Belement_id%5D=38&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=1890-1919">1890-1919</a>