Pope Leo XIV celebrated the Sagrada Familia Basilica as a masterpiece of “stones, colors and light,” as he marked the centenary of the death of its architect, Antoni Gaudí, with a Mass on Wednesday to inaugurate its final soaring sandcastle spire. Leo called Gaudí’s unfinished temple, one of the world’s most visited monuments, a “sign of unity and harmony for all of Spain,” an ongoing building project like the lifelong journey all Christians make to find God.