Maintaining the Monuments The National Park Service employs many special maintenance teams to keep the Mall beautiful. <span><span>Their role is to preserve the monuments and maintain the landscapes. Landscapers care for the grounds and remove 3-4 tons of trash daily.</span></span> A special crew preserves the monuments and memorials. In this photo one such worker cleans the <a href="http://mallhistory.org/items/show/33">Lincoln Memorial</a>. National Park Service Internal Archive 7/13/2012 <a href="/items/browse?advanced%5B0%5D%5Belement_id%5D=38&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=2000-present">2000-present</a>