And it's really, really easy to get to from Rome. Not to mention cheap. (At least if you book in advance).
The largest island in the Bay of Naples, Ischia has a history that stretches back to the Bronze Age. In later years, it was settled by the Greeks, who built its famous castle back in 474 B.C., and then by the Romans. It's now called Castello Aragonese, thanks to being rebuilt in the 15th century by Alphonse of Aragon.
The castle isn't just picturesque from afar; it's a must-see up close. Several churches are tucked inside, as are walking paths and lush gardens with some of the most beautiful views I've seen in Italy. And that's saying something. (Don't believe me? Check out the video below).