The 53-square-foot (5-square-meter) Holy Shroud, displayed in a quiet 17th-century chapel designed by Guarino Guarini, architect of the nearby Real Chiesa di San Lorenzo, bears the faded image of a thin, bearded man who appears to have wounds consistent with Biblical tellings of those suffered by Christ at his execution. Historians and scholars have questioned the antique relic’s authenticity—never officially recognized by the Catholic Church—for years, and the Duomo has gone to great lengths to preserve it. The contentious shroud is one of the highlights of Piedmont’s capital city, and a viewing is included in many Turin small-group walking tours along with the Royal Palace (Palazzo Reale), Piazza Castello, and Mole Antonelliana. Because of its age and delicacy, the shroud is stored in a climate-controlled case filled with a special atmospheric mix of argon and oxygen, and is rarely displayed to the public; in its stead, the church shows video footage of the original. The last public showing of the actual Holy Shroud was in 2015.