2006-04-18 - Alexandria, VA - Sphere

I was on a bus leaving Landmark Mall Shopping Center. It was a bright, sunny day with some high cumulus clouds. As the mall sits on top of a hill, the view is wide open. I was looking out the bus window when I saw what appeared to be a charcoal-gray metallic sphere floating in the air maybe 1,000 feet up. There were no apparent window, or lights, nor any sound. I thought at first it was a balloon--but soon realized that it had neither a basket underneath, nor was it moving at all...It was absolutely motionless. I was able to observe it as the bus traveled down the road until it took an exit. At that point we moved down hill and the view was hidden behind trees and buildings. I am curious if others in the Alexandria, Virginia area observed this.