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In 1920, as the Lincoln Memorial was being built, Popular Mechanics magazine gushed about a stunning feature of the monument to the 16th president, writing, in part: The “water mirror” would, of course, become the Reflecting Pool, which was the work of Lincoln Memorial architect Henry Bacon. Stretching some 2,000 feet (610 meters) from the steps of the memorial toward the Washington Monument at the center of the National Mall, the pool perfectly frames Lincoln’s...