When the last of the 4th of July fireworks have exploded, festivities at Roswell will just be starting.

A three-day Roswell UFO Festival marks the 66th anniversary of a flying saucer legend that made the New Mexico town forever synonymous with paranormal conspiracies.

In early July 1947 -- the exact date isn't known -- something fell out of the sky and crashed on a ranch near Roswell, leaving scattered debris. The ranch foreman was the first to see the material and he eventually told the Roswell sheriff, who then alerted the military at nearby Roswell Army Air Field, home of the 509th Bomb Group.

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