To one side of Piazza Trieste e Trento stretches the vast Piazza del Plebiscito, one of Italy's most famous public spaces, lined by an elegant sweep of Doric columns, the glorious Palazzo Reale—formerly the royal residence and now a museum—and the domed Church of San Francesco di Paola. To the other side of the square, along Via San Carlo, is the historic Teatro di San Carlo, the oldest continuously active opera house in Europe and a UNESCO World Heritage Site. It sits directly across from the 19th-century Galleria Umberto I shopping gallery and virtually next door to the imposing medieval Castel Nuovo. Visit Piazza Trieste e Trento and nearby attractions by joining a Naples history walk, or opt for a Vespa tour or a day of Naples sightseeing by vintage Fiat for a unique private tour.