saw between pine trees while driving, flew from left 2 right, centered then flew straight and disappearedwhile driving up Mt.Holomontas , which i think is the tallest in the Halkidiki region of Greece i was recording on video on my cell phone the pine trees. As we were commenting on the climate there- i zoomed in to see the trees better when a round object appeared from the left at the top of the trees a few 100 meters down the road.It was between the trees, like in the middle of the road.It flew right then back left a bit, sort of centered it's position flew straight and disappeared. i comment on video: "a UFO". stopped recording in shock i think to actually see it with my eyes and not through the phone. i have a 00:37 second video.