My choice was 'a little bit of everything', but that doesn't really capture the obsession.
As close as I can come to explaining my passion is the rain of tears that [in spite of my best effort to suppress them] cascade down my face when I burst onto Piazza della' Rotunda after dark and behold Hadrian's Pantheon. Of course, every incrotio in Italy provides a similar opportunity to be staggered to tears over the events that took place there and their significance for everything we know, even now.
Last year, I scared the *** out of some Japanese tourists when I bawled like little girl before Titiano's La Venere d'Urbino. [Yeah, not Roman, but I make scant distinction for these high points of Rome's legacy.]
It's to stand in those places and hear all those ancient voices that inrtigue me.
By the way, Fortuna willing I'll turn 60 in Campus Martuis next June.