In 1531, in what is now Mexico City, the indigenous man Juan Diego reported an apparition of a lady on the hills of Tepeyac, who asked him to build a church at the site. To convince the bishop of the authenticity of the vision, she instructed Juan Diego to gather roses during the winter. When he presented the flowers, the image of the lady miraculously appeared on his tilma — a cloth made from cactus fiber. Preserved for nearly 500 years, the image displays inexplicable characteristics. In 1921, a bomb exploded near the tilma, damaging the surroundings, but the image remained untouched. Scientific studies have failed to identify the pigments used or explain how the image was imprinted on the fabric. The Virgin’s eyes reflect human figures, visible only with modern imaging technology, and the tilma maintains a constant temperature of 98.6°F, the same as the human body. Today, this image is venerated at the Basilica of Our Lady of Guadalupe, attracting millions of faithful each year.