In the spring of 1917, amid the horrors of World War I, three young shepherd children - Lúcia dos Santos (10) and her cousins Francisco (9) and Jacinta Marto (7) - were tending their sheep in central Portugal. On May 13, in a hollow known as the Cova da Iria, they witnessed a dazzling lady “brighter than the sun,” dressed in white and standing atop a small holm oak tree. She identified herself as coming from heaven and asked them to return on the 13th day of each month for six months, urging them to pray the Rosary daily for the end of the war and the conversion of sinners. Over the following apparitions, she revealed three prophetic secrets (including a vision of hell, warnings of future wars, and a call to consecrate Russia to her Immaculate Heart), taught them prayers of reparation, and promised a great miracle. Despite skepticism, mockery, and even imprisonment by local authorities, the children remained faithful. On October 13, 1917, around 70,000 people gathered in pouring rain; the clouds parted, and the sun appeared to dance, whirl, and plunge toward the earth in a multicolored spectacle known as the “Miracle of the Sun” - an event witnessed by believers and skeptics alike, drying their clothes instantly and confirming the apparitions. Francisco and Jacinta died young (as foretold), while Lúcia lived to share the full message, which continues to inspire millions of pilgrims to this day. Where did this take place, and where is there a world-renowned shrine today, where millions of Catholics continue to converge? See Portugal's other two 'F's here