The Sagrada Familia is both Gaudi's masterpiece and Barcelona's delight. Its Passion Facade, on the basilica's western side, is also the home of a familiar-looking stone square. This square is divided into sixteen smaller squares, each containing a number. Like a type of Sudoku, these numbers are not random. Each column, each row and each main diagonal adds up to 33, Christ's age at his death. This square, in a smaller size, appears again in the right door of that same façade.