Interactive viewfinder: x-radiograph of Saint John the Baptist, from Real Monasterio de San Lorenzo de El Escorial and from the Museo del Prado; and restauration of Saint John the Baptist, Museo del Prado

• X-radiograph Saint John the Baptist, El Escorial
• X-radiograph Saint John the Baptist, Museo del Prado
• Restauration Saint John the Baptist, Museo del Prado