I was driving on a road west of Kelley, Iowa. The first sight was an extremely bright light fairly low in the sky. I was trying to determine if it could be a star or an airplane, but the light was way too bright.I reached my destination in a mile and turned into the driveway. By that time, I could tell the light was moving closer, it was nearly overhead. It was quiet and fairly low. When it was overhead it appeared to be a diamond with the huge "headlight" on the leading corner. The underneath had at least four lights in a square pattern.It appeared to have some depth and appeared to have "windows" with lights inside. If there was any noise it was somewhat of a whoosh, definitely not an airplane or helicopter sound. I did not get out of my car until it had gone past. I did not watch it very long after it went past; I just wanted to get in the house.