Tour to where you ask? French for against sunlight or daylight, Contre-jour is a technique where the camera points directly towards a lighting source, in this case the sun. I am yet to try it out in a closed setting. Like taking photos in b/w, the focus is on the shapes and the clean, sharp lines and not so much on the details.
They can see the brave silhouette from almost anywhere in the District of Columbia and use it as a compass to locate other monuments and eventually to find their way out of the great, gray federal wilderness ~ Hugh Sidey