Inside Napoli's duomo, there is a chapel to San Gennaro, the city's patron saint. And inside the chapel is this silver, vestment-adorned bust of the saint himself. As I learned, this reliquary contains not only bones of the saint, but also a vial of his dried blood. Several times a year, the blood liquifies (usually on September 19, the saint's feast day, but recently in the presence of the visiting Pope Francis.) I love stuff like this.