During a recent trip to Washington, D.C., I discovered that the reflecting pool between the Lincoln Memorial and the National World War II Memorial had lost a bit of its luster. From inside the Lincoln Memorial, my gaze at the National Mall was interrupted by fencing, heavy equipment, and an empty pool.
However, an aerial view of Washington, D.C. from Google Maps provided no hint of the ongoing construction. So, based on some online research, I wanted to determine when the aerial photo used by Google was taken, as well as whether Google, Microsoft/Bing or Yahoo offered the most up-to-date maps.
