There's something about Rome and black and white that goes very nicely together. For me I think that the black and white photographs of Rome make you think back to those classical cinematography moments set in Rome.
OK, so we couldn't get photographs IN the Trevi fountain like Anita Ekberg in La dolce Vita but it still makes for a great backdrop!
And then the Spanish step take you back to the time of Gregory Peck and Audrey Hepburn in
Aside from the Hollywood films though Rome has the backdrops to create beautiful movie sets in their own right. Even on a grey day I love the view below of the Via Condotti from the top of the Spanish Steps.
Of all of Rome's ancient sites my personal favorite is the Pantheon. An incredible structure that looks even more impressive in black and white.
And then there is the Colosseum and it doesn't matter what angle you choose there is a great picture to be had. All these photographs below were taken around the Colosseum.