It was hovering over the tree line in the field across from the visitor center. It almost looked like a huge drone, about the size of a small plane, triangle-shaped, and 3 big lights with smaller ones. It was in the sky completely still, with no wind moving the trees below, just still in the air. we turned around after seeing it knowing that was a weird sight. it was probably a minute after the sighting and the ufo was gone, nowhere in the sky. not to mention the tone of the situation felt strange. I was about to take a photo but as these things go, I was too late.