Doing some work outside when I noticed odd aircraft.

I was working outside at my new house. (I live up on the top of a hill with no obstacles hindering my view for at least 50 miles.) I noticed an odd shaped aircraft just gliding right overhead. At first I thought it was a blimp but I am familiar with blimps and this wasn't shaped or really looked like one. This was more flat and straight like a pipe. It resembled as if it were made out of stainless steel. I didn't see any lights or markings. There were no wings and no propeller noise. I watched it for a few seconds and realized that it wasn't making any sound. I took out my phone to get a couple of pictures. I wasn't really thinking about taking video or more pictures. I kind of just wanted to watch it with my eyes. I jokingly posted the pictures on Facebook and thought no more of it.
Now, almost a year later, I have yet to see anything quite like it. I have become accustomed to all sort of air traffic around here. I have a lifetime of experience being around aircraft. My step-dad was in the Airforce and we would attend many "open houses" while growing up.
I also spent time in the Marines. I have worked at O'hare and Midway Airport.
I really believe that I know what a conventional aircraft looks like. This one has me scratching my head though.