Yungay, Peru, March 1967-On March 22, at 5:30 P.M. hundreds of Yungainos and tourists, were visited by two UFOs. They flew over the snow covered Huascaran mountains and the city of Yungay-Peru. Photo by: Augusto Arrando. This UFO's domed top appears to be made of the same material as the rest of the saucer, instead of the traditional see-through top. 

Source/Text credit (ufocasebook.com)