Trying to list all of Rome’s famous sites would fill the pages of a short book. Everyone visits Rome for a different reason and the fortunate visitors make more than one trip.
Rome is so rich in romantic cultural sites that it’s difficult to pick out something special, but the Trevi Fountain, the modern Auditorium Parco della Musica, which was planned by Renzo Piano and the "Terme di Caracalla," which is the famous site where summer opera music plays are held give each visitor a special feeling about the city, which can only be defined as an romantic moment.
The old area of Trastevere is considered the "soul" of Rome with its beautiful romantic piazzas and churches. Of course you must see the Spanish steps. Built in the 18th century the steps are the longest and widest staircase in Europe. Palazzo Farnese, which is now the French Embassy, was built in the 16th century as a Renaissance palace. The nearby romantic Piazza della Quercia, which is the home of the small church of Santa Maria della Quercia, was built in the 13th century and there is a romantic little restaurant on the Piazza that’s a special treat because it’s away from the noise of the city. The hills Monte Mario is considered the balcony of Rome and Gianicolo offers a panoramic view of the entire city of Rome and is definitely worth the trip.
Certainly the Vatican, the Catacombs, the Coliseum and other attractions that have made Rome what it is today are all worth seeing.