The Three Secrets of Fatima consist of a series of visions and prophecies claimed to be given by an apparition of the Blessed Virgin Mary to three young Portuguese shepherds, Lúcia Santos and her cousins Jacinta and Francisco Marto, on July 13, 1917. The three children claimed to have been visited by a Marian apparition six times between May and October 1917. The apparition is now popularly known as Our Lady of Fatima.

The "miracle at Fatima" is arguably the most well-known apparition of the Blessed Mother. Her appearance to three shepherd children in Portugal in 1917 was, according to many witnesses, accompanied by several unexplained events, including a shared vision of the sun dancing and moving about erratically in the sky.

During her many appearances to the children, "Our Lady" bestowed upon them three prophecies. The first two were disclosed by Lucia dos Santos, the eldest of the three children, after she wrote them down in the early 1940s, but the third and final prophecy was not to be revealed until 1960. Well, 1960 came and went, and the third prophecy was not revealed because the Vatican said the world was not quite ready for it. This reluctance to disclose the secret lead to speculation among the faithful that it contained information about our future that was so horrific that the Pope dared not reveal it. Perhaps it foretold a nuclear war... or the end of the world.

Read more at http://theunexplainedmysteries.com/fatima-prophecies.html