The Expiatory Chapel is a memorial to Monza, wanted by Vittorio Emanuele III to commemorate the assassination of his father, Umberto I. The King, shortly after his father's death (on July 29, 1900), gave the project to the architect Giuseppe Sacconi, already author of the Victorian project of Rome. The work was completed in 1910, so that it is ready to mark the 10th anniversary of the attack. The monument, built on the exact spot of the attack, is surrounded by a leafy garden, enclosed by a wrought iron railing. The Interior of the temple, circular, is covered with mosaics of Byzantine inspiration and marbles of different colors and of different origins. Various subjects to depict in mosaic, sails, Angels with the symbols of the passion of Christ and, in round, Saints and blesseds of the House of Savoy. From the outside leads to the crypt, with a Greek cross shaped, covered by polychrome marbles and bronzes. The times are a mosaic reproducing a starry sky. At the junction of the four arms of the crypt is a black marble stone which bears engraved the date of July 29, 1900, remember the spot where King Umberto I was shot by anarchist Bresci. A faint golden glow filtrada ten Windows closed by slabs of Alabaster. Every July 29, from 1911, held a commemoration ceremony of the assassination with a celebration in the chapel. A few years after the monument is visited by Benito Mussolini, who with a stone carved the inscription: monument to Banks. At night, each July 29, the monument is illuminated from within by the two crosses of Alabaster.