Expiatory Chapel of Monza, National memorial chapel in Monza, Italy.

The Expiatory Chapel stands at the end of a short fir-lined avenue off Viale Cesare Battisti, near the Royal Villa of Monza. A wrought-iron fence by Alessandro Mazzucotelli encloses a grey mosaic-clad wall; inside, a stepped base carries a bronze balustrade by Giovanni Lomazzi and a polygonal chapel. From it rises a 35-metre stele of Oggiono stone with two translucent alabaster crosses, topped by an urn holding the Savoy crown, sceptre and Collar of the Annunciation. Lodovico Pogliaghi's bronze Pietà sits at the foot.

King Vittorio Emanuele III commissioned this chapel at the location where anarchist Gaetano Bresci assassinated his father, King Umberto I, on July 29, 1900. The structure was built as a national response to this tragic event.

Every 29 July since 1911 a commemoration of the regicide has been held in the chapel, promoted by the Istituto nazionale per la guardia d'onore alle reali tombe del Pantheon. On the night of 29 July the monument is lit from within through its two alabaster crosses. The interior mosaics, made by Antonio Castaman from cartoons by Emilio Retrosi, show angels with the symbols of the Passion and, in the roundels, saints and blesseds of the House of Savoy.

The chapel stands at the end of a short fir-lined avenue branching off the exedra on the left of viale Cesare Battisti, near the entrance to the Royal Villa. The crypt, a Greek cross in polychrome marble and bronze, is reached from outside the chapel. On the night of 29 July the monument is lit from within through its two alabaster crosses.

A black marble monument marks the exact spot where King Umberto I was assassinated, situated in the crypt beneath intricately decorated mosaic vaults. This precise marking allows visitors to understand the historical tragedy at its exact point of origin.