One of the most celebrated days on the Mexican calendar is the feast of Our Lady of Guadalupe, Patroness of the Americas and the Unborn. This feast day commemorates when Mary appeared to Juan Diego in Mexico in 1531. Fiestas, or public celebrations, are held in honor of Mary on December 12. Catholics across Mexico and other countries take part in pilgrimages to see the image of Mary, believed to be authentic in the Basilica of Guadalupe in Mexico City. Thousands come to the church to pray. The popularity of this religious feast has grown particularly along the southwest U.S., including cities such as Los Angeles. To hear the story of Our Lady of Guadalupe, click here.