National Geographic : 1931 Nov
OUR COLORFUL CITY OF MAGNIFICENT DISTANCES ( National Geographic Society Finlay Photograph by Clifton Adams THE NEW WORLD'S NOBLEST OBELISK Washington Monument towers to a height of 55517 feet. It was begun in 1848 but not com pleted until 1885. The line visible in the masonry just above the tree tops marks the place where construction was suspended for 23 years. At night from the chamber at the top of the Monument airplane signal lights warn night flyers of the towering shaft's whereabouts.