I was visiting Tiahuanaco, an old archeological site on the border of Titicaca lake. I've only realized about the UFO many months when I was looking the photos I've shooted there. The object was very far in the direction of the mountains, out of airways path, cause the SLLP or La Paz international airport is some dozens miles from there, it doesnt look or behave like an aeroplane. Well the photo is attached. It says everything.