I was going south on carpenter rd in milan michigan about 4pm on august 22, 2017 when i saw a very large and tank like craft about 200 ft above me and right in front of me. it continued to go to the southwest on main street. i only saw it for about 20 seconds but it was very unusual. it had no propellers or any windows. there aren't any commercial buildings that would have anything for an advertisement in the area.