Start looking skyward - July 2 is World UFO Day! Held on July 2 every year in commemoration of the infamous 1947 Roswell UFO Incident, World UFO Day turns a spotlight on the endless and ever-growing phenomenon of UFO sightings all over the world. Are these UFOs secret government aircrafts? Extraterrestrial visitations? A little of both? While the true identity of UFOs is still hotly under debate, it cannot be denied that for over a century - and quite possibly in many centuries past - people have been witnessing unidentified flying objects in the skies.