Washington Monument Washington Monument

National Geodetic Survey crew members Roy Anderson, left, and Steve Breidenbach set up survey equipment used to measure the height of the Washington Monument. National Geodetic Survey/NOAA hide caption

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National Geodetic Survey/NOAA

Monday night when the lights came on, visitors came to see a glowing Washington Monument. Jonathan Ernst /Reuters/Landov hide caption

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Jonathan Ernst /Reuters/Landov

NPR's Trina Williams on the lighting of the Washington Monument

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