Milagros (also known as an ex-voto or dijes or promesas) are religious folk charms that are traditionally used for healing purposes and as votive offerings in Mexico, the southern United States, other areas of Latin America, and parts of the Iberian peninsula. They are frequently attached to altars, shrines, and sacred objects found in places of worship, and they are often purchased in churches and cathedrals, or from street vendors.
Milagros--Miracle... "Typically, a believer will make a vow to a saint or to a sacred object, and later they will make a pilgrimage to the site of a shrine or church and take a Milagro there and leave it as a sign of gratitude and devotion. People also carry Milagros for protection and good luck."
Milagros means "miracles". These traditional metal charms are used to help that saint perform a miracle (hence the word "milagro"). There is supposedly a milagro for virtually every animal, every organ and every imaginable malady. I was smitten by the metalwork and repousse. This was a stealth shot. I got quite sneaky with my little spy camera.