The official name of the monument is the Altare del Patria, Altar of the Fatherland. It houses the Museum of Italian Unification and the Tomb of the Unknown Soldier. It’s construction was rather controversial, as it put a huge white edifice in the middle of a medieval area of Rome. Additionally, its size and overly ostentatious architecture make it a bit of an anachronism in the Eternal City.
How about another slide from 1960…
Clearly, this is not the Arc de Triomphe; which arch do you think this might be?
The slide, from which this scan came, was processed in August of 1960; it was shot on Kodak Ektachrome slide file. Despite its age, the typical Ektachrome pinkish cast (due to cyan dye fading over time) is rather minimal