Back in 1954 this movie taught me that all women want husbands, preferably hot Italian husbands, but a snooty old American will do if you're a desperate 35-year-old who's practically an old maid already. The woman who toss coins in the Trevi fountain are Jean Peters, Maggie MacNamara, and Dorothy McGuire. The men they're after are Rossano Brazzi, Louis Jourdan, and Clifton Webb.
There are many plot complications, but don't worry. All's well that ends well, and who cares about the plot? What really matters here is that the movie was filmed in Rome and Venice in full color and in CinemaScope. I hope you took a look at the trailer, since it pretty much makes that point. Back in 1954, for a kid sitting in a theater in a small East Texas town, color and CinemaScope seemed about as close as he'd ever come to seeing the Grand Canal and St. Mark's Square. It was that way for a lot of people in those days, and this movie gave me (and them) a great travelogue wrapped up in three nice stories.
Is the stories believable? Not for a minute, what what does that matter to an impressionable kid? Or to an adult who can remember that kid? It's a product of its time, for sure, so view it as a charming historical artifact.
The title song was sung over the opening credits by Frank Sinatra, as you know if you watched the trailer, but the massive radio hit was the recording by the Four Aces, which will appear later as the Song of the Day.