10. The Phoenix Lights, 1997

Something happened in the skies over Phoenix, Arizona on the night of March 13, 1997, although there remains much disagreement about what it actually was. What appeared to be an enormous craft was seen silently gliding over the area and was observed by hundreds of witnesses. Estimates suggested that massive craft may have been a mile in length. Numerous videos and photos of the strange lights surfaced, but the craft itself was extremely difficult to see, although some witnesses reported that it blocked out all of the stars in the sky as it passed above them. One group of witnesses even described rows of windows on the craft with the silhouettes of occupants visible inside. The military explained the event by stating that the lights were simply flares that were dropped by warplanes conducting exercises in the area – a claim dismissed by the majority of those who actually witnessed it.