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With more visitors than Yellowstone, Yosemite and the Grand Canyon combined, the National Mall is sometimes called the nation's front yard. But it's hard to keep your yard looking good when 22 million people tromp across it each year. As the nation marks the 50th anniversary of the March on Washington in 1963, we explore the challenges of maintaining the Mall as both the country's most-visited open space and its favorite place to protest.