The "Phlegrean Fields" (so named by the Greeks, who were amazed by the "burning" volcanic activity) are a large Western suburb of Naples, encompassing an area rich with history and natural beauty (including Monte Barbaro/Cratere del Gauro, now known as Carney Park). The following are some of the main sights to see. Ulixes.it is a bit outdated but still useful for learning about the Campi Flegrei; Slow Travel has a nice introduction with an overview map.
Originally the Greek city of Dicaearchia and later the Roman city of Puteoli (where St. Paul stopped on his way to Rome—check it out in Acts 28:13-14), Pozzuoli still has an ancient, albeit somewhat gritty, charm. It's also the hometown of actress Sophia Loren.
3 main sections of Pozzuoli:
Porto (port) - where ferries dock, home to fancy restaurants hugging the water and fish market
Lungomare (aka Via Napoli aka Corso Umberto I aka Lungomare Pertini) - nice boardwalk with dozens of sidewalk restaurants and bars
Anfiteatro (Amphitheater) - Roman ruins and smaller pubs.
Anfiteatro Flavio (Flavian Amphitheater)
The third largest Roman Amphitheater in Italy (after the Colosseum in Rome and Capua amphitheater near Caserta), this former venue for gladiator fights still preserves many of the underground passages which were used to move fighters, beasts, and scenery to the main arena above.
40°49.55'N 14°7.5'E at Via Nicola Terracciano 75
For more information about the ruins themselves, Ulixes' anfiteatro page gives a good overview in English but has outdated hours; also see Wikipedia page.
Little known fact: Pozzuoli actually has two amphitheaters. The older, smaller one ("anfiteatro minore") dates from the Republic of Rome and only has a few walls remaining, mostly near the Metropolitana train tracks and Via Vigna (Google Maps link). The fact that Pozzuoli had two amphitheaters shows you how important it was in the Roman empire. There's also the ruins of a stadium (racetrack) build by Antonius Pius, Stadio Antonio Pio (Google Maps link).
These hot sulfurus vents have been amazing people since ancient times; this was also the site where San Gennaro (Saint Janarius) was beheaded. (The Sanctuary of San Gennaro commemorating his martyrdom is just outside and up the hill from the Solfatara gates.)
The official website has hours, prices, etc...note that it's privately-run so Artecard holders get a discount but not free entry, and their policies for children are less generous than state-run sites (>12 pay full price, 5-12 get a discount, and <5 are free)
A few years ago, the Solfatara caused a stir when a study proclaimed it a "natural Viagra"!
Tempio di Serapide (Macellum)
Because they found a statue of the god Serapide (Serapis), early archeologists thought this was the Temple of Serapide—a name that still sticks (e.g. on many of the nearby restaurants and streets). However, it was actually an elaborate Roman marketplace or Macellum—I like to think of it as the elegant food court in the Roman mall. Although you can't enter the site itself (except by special appointment, see below), it's cool to see the Roman market on your way to the new Italian market.
This "land district" is the site of the original acropolis of the ancient Roman and Greek cities of Dicaearchia and Puteoli. Shuttered in the 80's after a devastating earthquake, many of the ancient underground ruins and 17th/18th-Century palaces above are now restored and available for tours. It's almost an "underground Pompeii."
Guided tour (in Italian) at various times, mostly weekends
Open Saturday / Sunday / Holidays 9-12 and 13:30-16:30
Call for reservations at 081-199-36286 or 081-199-36287...or you can go the "Infopoint" during opening hours; more on the Pozzuoli town website
You might also be able to visit the Cathedral most weekends; the Cathedral website is down as of early 2021 but the Diocese page has some worship & visiting times (mostly on weekends) listed
[You could also try emailing firstname.lastname@example.org ? Other numbers listed on other websites are 081-192-55646, 081-190-09000 and maybe email@example.com ?]
Jeff Matthews' Naples Life Death & Miracles gives you some context about the area
Other Pozzuoli Attractions and Activities
Pozzuoli Market: see the Mercati section of the Shopping page.
Abraxas Osteria - innovative food in charming restaurant overlooking Lago d'Averno, rec'd Slow Food Osterie d'Italia 2021
Pizzeria La Dea Bendata - Corso Umberto I 93 (aka "via Napoli" Lungomare), rec'd Slow Food Osterie d'Italia 2021
Dolci Momenti al Porto - Largo San Paolo 24, delicious pastries (Luke especially likes their Sfogliatella Santa Rosa) near the port
La Fattoria del Campiglione - Via Vicinale Campana 2 (just outside of Carney Park), great steak/meat place
worth checking out?
?? Mammà Modern Cucina Napoletana - near "bumpy tunnel", outstanding TA/Google reviews
? Cipó 95 - informal bar/pizzeria near the port, outstanding TA/Google reviews
? N'copp 'a Terra - near the Solfatara, looks like fresh takes on traditional dishes
Putipù Bistrot - seafood specialist, good TA/Google reviews
Tribus Restaurant - looks like a fancier place, near "bumpy tunnel", very good TA/Google reviews
Trattoria da Rita - near "bumpy tunnel", looks like nice spot, popular on TA/Google
Vinaria Vino & Sapori - somewhat fancy/fusion place near Cuma, good TA/Google reviews
Places rec'd in 2010, not sure now:
Taverna Brudi (di Cola Benedetto) - Via Vigna 15, chef Dino serves up delicious antipasti, seafood, grilled specials, but avoid house red (Solfatara smell) --> looks like still great TA/Google reviews?
Tenuta Convivium - beautiful spot near Cuma/Arco Felice Vecchio that back in 2010 served feasts with amazing antipasti and other dishes, popular on TA; now also has rooms for rent
Boccuccia Di Rosa - V. Milite Ignoto 11, 081-526-9494, popular & cheap pizzeria/restaurant near amphitheater
La Cucina di Ruggiero - Via Lucrino intorno al lago 3 on Lago Lucrino, all-included smorgasbord hosted by the entertaining Sig. Ruggiero
Osteria D.O.C. - Corso Umberto I 181 ("Via Napoli" lungomare), fixed price meal, italian regional specialties; includes bruschette, pasta, meats/cheeses & wine
Acqua e Farina Pizzeria - Via Gerolomini 5 (near "Via Napoli" lungomare), one of Pozzuoli's most popular pizzerie (some mixed reviews on Google Maps...?)
Ferries from Pozzuoli to Ischia, Procida, (and, in the summer, Capri, Amalfi, etc.): see the Ferries section of the Get Around page
Gelato: see the Gelato page.
Good caffe and pastries: Caffeteria Buono (on Via Napoli—very inventive coffees) and Dolci Momenti (in the Port area—great classic coffee drinks and delicious pastries).
Pozzuoli Night life: the most bars are on Via Napoli, but some are in the port (including the popular ex-pat Irish pub Druid's) and amphitheater area (including Madigan's, another Irish pub popular with ex-pats).
The Pozzuoli "pro loco" website is in Italian only but isn't a bad place to learn about parks and other attractions
These towns are to the west of Pozzuoli, with two large lakes (Lucrino and Averno) dividing up the land.
Arco Felice Vecchio
This old Roman "happy arch" seems impossibly high considering its ancient construction, and is still used by cars. (There's not much to see but it's fun to drive through.)
Home to the Temple of Apollo, this lake featured in Virgil's Aeneid.
The "new mountain" that sprang up almost overnight next to Lago Lucrino in 1538, this is now is a natural park that you can hike. The "bumpy tunnel" (full of speed bumps) from the Tang to Baia/Bacoli runs underneath.
A cute seaside town, Baia was once the home of Roman Imperial villas, which explains the rich archealogical sites.
Lago Fusaro/Casina Vanvitelliana (Casino Reale di Vanvitelli)
Fusaro lake features a splendid house built on the water by Vanvitelli for Bourbon King of Naples Carlo I, who loved to watch the geese on the lake.
Castello Aragonese di Baia/Museo Archeologico dei Campi Flegrei
This Castle built by the Aragonese dynasty has splendid views of the Bay of Pozzuoli, as well as interesting artifacts in its Archeological Museum (including statues found underwater in the regions nearby)
Via Castello 45, 081-523-3797
Terme Romane di Baia (Roman Spas of Baia)
This sprawling archeological park encompasses many of the villas and spas that rich Romans vacationed in. Many were mis-labeled as "temples" in the 19th century, so the Tempio di Venere (Temple of Venus), visible from the Baia port, and the Tempio di Diana (Temple of Diana), a big half-dome now used for concerts, were both actually rooms in a huge thermal spa.
Touritaly's page has nice maps and photos, and Rai's Baia archeological park page also has useful information.
Main park is at Via Fusaro 37
081-868-7592, hours/information at Parco Archeologico Campi Flegrei
Parco Sommerso di Baia (Baia Underwater Park)
Bradyseism, a slow earthquake causing the land to sink, caused much of the old cities of Baia and Portus Julius to sink into the sea. Now these facinating sites can be visited via glass-bottomed boat or SCUBA diving. Rai's Underwater Baiae page also has useful information.
to visit email firstname.lastname@example.org
The modern town of Cuma was once the ancient city of Cumae, the first Greek colony on the Italian peninsula, and was famous well into Roman times as the home of the oracle Sibyl.
Cuma Archeological Park (Cumae)
Antro della Sibillia - a trapezoidal a cave where the oracle Sibyl would tell prophecies...or maybe it's just a military fortress. Either way, the strangely shaped walls interrupted by shafts of light is cool. Atlas Obscura has more info/photos.
Acropolis - just above the Antro, has breathtaking views and remains of what once were splendid temples to Apollo and Jove. Legend has it that this is where Icarus fell after going too close to the sun--hence the temple to Apollo the Sun God.
081-854-3060, hours/information at Parco Archeologico Campi Flegrei
To get to Cumae, go past Touchdown Jesus, through the Arco Felice Vecchio, turn right at the T, and then make a left following signs to the archeological park.
Once the home of the Roman Navy, Miseno still has Piscina Mirabilis (or "Piscina Mirabile", an ancient water cistern), the underwater remains of Portus Julius, and various other Roman vestiges. The area is also home to beaches and a lighthouse at Capo Miseno (the cape).
Site of the JFC base, this small town is on the ancient via Domitiana that connected Rome and Pozzuoli (Puteoli)
Ruins of a Roman town that was famous as the retirement home for General Scipio Africanus. More at Atlas Obscura and Naples LDM.
Organization of several sites including 4 that charge admission (Pozzuoli Amphitheater, Baia Castle/Museum, Baia Roman Spas, and Cuma Archeological Park), costing [as of 2021] €4 for a single site or €8 for all 4 sites (within 2 days); kids <18 are free. They also offer an annual €20 "myfleg card" the Artecard (see below) is a better deal for most (adult) residents (since it also covers the more expensive/popular sites like Pompei, Herculaneum, Archeological Museum, Caserta Palace, Paestum...).
Some of the sites (Pozzuoli Macellum / Tempio di Serapide, Miseno Piscina Mirabilis, Parco Sommerso) require reservations to access by emailing email@example.com
This card includes the most popular museums/sights (except the Solfatara and Miseno Piscina Mirabilis, which are privately owned). If you live in Naples and are at all interested in history/museums, consider getting the annual €43 [as of 2021] Artecard 365 Gold Pass (or if you're 18-24 years old the €33 365 Gold Pass Young), which lets you visit most sights 2 times for free. Occasionally they also offer discounts.
(Note: the main site says you get access to all the Parco Archeologico Campi Flegrei sites 2x/year but other sites talk about a €2 charge, this might be the discounted price for short-term Artecards who have used up their free visits?)