Nisida is a volcanic island near Cape Posillipo southeast of Naples. The crescent shaped island is connected to the mainland by a stone bridge. Being a volcano, there is a flooded crater forming the bay of Porto Paone on the southwest side--a small cove, really. The island is a bit more than a half mile across and juts out of the Tyrrhenian Sea to a height of 350 feet.
You can park and walk to the island on the stone bridge or go by boat--renting one at the nearby marina. Visiting the far side and cove of Nisida is really the best way to enjoy its natural beauty. Nisida doesn't have a beach of its own, but the rocky side of the island is worth exploring by boaters.
There is a large public beach on the mainland facing Nisida, with a parking lot just on the left before the causeway. Adjacent to the causeway is a public marina where you visitors might be able to hire a boat. Several restaurants are also nearby. As with many parts of Italy, some of the area is covered in graffiti and looks worse for wear, but then again, this is Naples.
If you walk to the island, you can hike in the non-restricted areas and take in the views of Naples and the surrounding bay and islands. The pebbled beach is surrounded by clean crystal clear water. You can relax in a private shady spot in the woods that cover the island nearly down to the beach. If you sail, you can rent small sailboats and cruise the waters around the island, and if you go by boat, be sure to check out the arch and the grottoes cut into the far side of the island.
In the time of the Romans, politician and military leader Lucius Licinius Lucullus built a villa on the collapsed and flooded island volcano of Nisida. Another general, Marcus Iunius Brutus (of et tu Brute fame) also built a villa there for holidays and some say the plot to assassinate Julius Caesar was plotted there. You might say this was the Cape David of the day where the military leaders went for vacation, to rest, recharge and ponder their next battle while they enjoyed the comfort and pleasures of this island in the sea.
Brutus's wife Porcia, committed suicide sometime after learning of Brutus' plan to assassinate Julius Caesar. Some historians think Brutus and Cassius hatched their plan here on Nisida. Some of the archaeological remains on Nisida are supposedly of Brutus' villa.
Since then, there have been monasteries, a castle and even a prison on the island. Artists and noblemen would flock to it and even Cervantes was inspired by its mystery and charm. Today there is a rehabilitation center on the island for young boys at risk where they learn trades such as carpentry, ceramics, glass-making and other skills. The NATO Maritime Command also has it's headquarters on the island, although most of their personnell has moved to a newer facility further north.
In addition to the island itself, it's worth a visit to Parco Virgiliano (the Park of Remembrance), a scenic park located on the hill of Posillipo, just across from Nisida. The Park serves as a green oasis atop the tufa stone typical to the coast of Posillipo. A series of terraces 500 feet above the Gulf of Naples provides the park with a unique array of impressive vistas, including views of Nisida... the views at sunset are stunning.
For SCUBA divers and kayakers, the rugged coastline just to the east of Nisida , know as Area Marina Protetta Parco Sommerso di Gaiola is also worth exploring. There are several kayak rentals nearby and many sea grottoes to explore. If you are diving, the opportunity of diving through a sunken Roman villa can't be missed.
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