When we arrived at the parking lot in the evening, we saw a circular glowing aircraft pass over the parking lot.

While on vacation in Washington, we went skiing at Crystal Mountain. We got off the bus & we were loading our ski gear into our car. I glanced up and saw something lit up in the sky. I assumed it was a helicopter or airplane so I went back to what I was doing. Then, my mom also looked up and told me to look again. This time, the object was much closer to us and lower to the ground. It slowly & smoothly passed over us at a low elevation - close enough to see that it was circular and had a blueish white glow to it. It was also moving completely silently. I passed over us from north to south and then took a hard turn to the west and disappeared behind the bluffs.