It is the most famous so-called UFO sighting in the world. "The Phoenix Lights" captured the world's attention 17 years ago on March 13, 1997.

Every year new witnesses come forward to tell the story they kept to themselves all those years. One man who still wants to remain anonymous told CBS 5 News he was working on his roof air conditioner around 8 p.m. that evening when he saw it. He said he never told anyone outside his family until this year.

There are only four known videos that capture what happened in the sky over the Phoenix area. Each one shows a slightly different view of a series of lights out west. They blink on for a few minutes, then disappear.

The U.S. military maintains those lights were part of a training session involving flares dropped over the Barry M. Goldwater Range near Gila Bend, AZ.

Witnesses like Sue Watson believe differently, because they saw something else.

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