Anzio [ˈantsjo] is a city and comune on the coast of the Lazio region of Italy, about 51 kilometres (32 mi) south of Rome. Well known for its seaside harbour setting, it is a fishing port and a departure point for ferries and hydroplanes to the Pontine Islands of Ponza, Palmarola and Ventotene. The city bears great historical significance as the site of Operation Shingle, a crucial landing by the Allies during the Italian Campaign of World War II. Wikipedia
Home to pretty treasures, Anzio is Italy's best kept secret. After your splendid visit to Anzio, you can proceed to an important near-by city of Rome. Take a short trip from Anzio and set some time aside to explore the Rome. Dotted with places like Colosseum, St Peters Basilica, Pantheon; it will definitely be a good idea. Also, to reach Anzio, you'll have to take a flight to Rome; so its not really a detour. And even if it is, the city is worth paying at least a quick visit. A holiday in Anzio can generally be of 1-2 days.
Don't just take a trip, let the trip take you! Have a enjoyable time at Anzio.