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The Washington National Monument, in the city of Washington base of the Pantheon, 250 feet diameter. Height, 100 feet. Height of obelisk, 500 feet. The loftiest monument on earth to a nation's greatest benefactor. (Courtesy: Library of Congress)

The Washington National Monument, in the city of Washington base of the Pantheon, 250 feet diameter. Height, 100 feet. Height of obelisk, 500 feet. The loftiest monument on earth to a nation’s greatest benefactor. (Courtesy: Library of Congress)