The object was clearly flying over the Pyramids in Mexico CityWe were visiting the pyramids in Mexico City and taking pictures. While we were on top of the "SUN" pyramid, we took some pictures towards the "MOON" pyramid, and realized that there was an object that appeared in the picture. We looked around for a while until we saw the object at a distance closer to the "MOON" pyramid.We only saw one object the shape of a sphere. It appeared white in the distance, but may have been reflective. There were no other visible objects around us in the air. We were at the peak of the "SUN" pyramid and looking towards the "MOON" pyramid.It was a clear day with plenty of sun. The object was visible to us for about 20sec.