Catacombs of San Giovanni, Syracuse: What to Expect Underground

What the Catacombs of San Giovanni Actually Are

The Catacombs of San Giovanni — formally the Catacombe di San Giovanni Evangelista — are a network of early Christian underground burial galleries cut into the soft limestone beneath the ancient Greek and Roman city of Syracuse. Dating from roughly the 4th to the 6th century AD, they were created after the Edict of Milan in 313 AD made Christianity legal, giving the Christian community the ability to bury their dead openly and at scale.

The layout follows a notably organized plan: a wide central corridor called the Decumanus Maximus runs the length of the site, with approximately ten secondary passages (Cardines) branching off at right angles. This Roman-grid logic was not coincidental — the tunnels were dug along the channels of an older Greek aqueduct, reusing the existing underground infrastructure. The result is a catacomb that feels more spatially coherent than many comparable sites, though no less disorienting once you are inside.

The scale is significant. The underground area covers more than 10,000 square meters and contains around 10,000 individual tombs, with some estimates reaching up to 20,000 burials when grave reuse over centuries is accounted for. These numbers make Syracuse's catacombs second only to those of Rome in terms of size among early Christian underground cemeteries in Italy.

The Ruined Basilica Above: An Overlooked Starting Point

The entrance to the catacombs is not underground. You arrive first at the Basilica di San Giovanni Evangelista, a 6th-century church that was built directly above the burial site, using the catacombs as its sacred foundation. The basilica suffered heavy damage during the Norman conquest at the end of the 11th century and then largely collapsed in the 1693 earthquake that devastated much of southeastern Sicily. What remains is an open-roofed shell of apses, columns, and stone arches — roofless, weather-bleached, and genuinely beautiful in the way that ruins are when they have been allowed to stay ruined.

Visiting the basilica exterior before descending gives important architectural context. You can see the relationship between the two structures, understand the scale of what was once a major religious complex, and take photographs in natural light before entering the dark. In the morning, the low-angled sunlight catches the pale stone columns at a striking angle. By midday, the site becomes bright and flat, better for reading detail than for photography.

The basilica compound also connects to the broader landscape of Syracuse's archaeological heritage. The nearby Neapolis Archaeological Park is a short walk away, and combining both sites in a single morning or afternoon is a practical choice. Together they form a coherent picture of how Syracuse moved from the Greek and Roman world into late antiquity.

Inside the Tunnels: What You See and How It Feels

The temperature underground is consistent — typically around 15 to 16°C regardless of the season above. In July or August, when Syracuse can reach 32°C, the drop is immediate and stark. Bring a light layer if you run cold; the visit lasts long enough that the chill becomes noticeable.

The air is dry and faintly mineral, the smell of old stone rather than damp earth. The tunnels are narrow enough in some stretches that two people cannot walk abreast comfortably, and the ceiling height varies. The main Decumanus Maximus is tall and relatively wide, more corridor than cave. The secondary Cardines are tighter and lower, and these are where most of the individual tombs — called loculi — are carved directly into the walls, stacked in rows. Many are empty; some retain traces of red ochre or Christian iconography scratched or painted onto the stone.

The guide will typically point out arcosolia, which are arched tomb niches designed to hold bodies horizontally in a posture suggestive of sleep rather than death — a distinctly Christian funerary symbolism. Some of these larger niches once held the burials of wealthy or prominent individuals and retain fragmentary decoration. There is also a crypt traditionally associated with Saint Marcian, the first bishop of Syracuse, though the historical claims attached to specific locations in ancient catacombs should be treated as devotional tradition rather than confirmed archaeology.

Crowds, Timing, and What the Seasonal Hours Mean in Practice

The catacombs receive a fraction of the visitors that comparable sites in Rome attract. Even in peak summer, the tours tend to be small groups — rarely more than fifteen to twenty people — and the atmosphere inside remains quiet. That said, the guided tour format means you are tied to the schedule. If you arrive just after a tour has started, you may wait up to thirty minutes for the next one. Arriving at opening time in the morning is the most reliable way to join the first tour without waiting.

Seasonal opening hours vary significantly. From November to February, the site is typically open Tuesday to Saturday from about 9:30 to 12:30 and 14:30 to 16:30; from March to June and again in September and October it generally opens daily from about 9:30 to 12:30 and 14:30 to 17:30, and in July and August from about 10:00 to 13:00 and 14:30 to 17:30, with a consistent midday closure between sessions. Planning around this gap matters — arriving at 12:15 means a two-hour wait or needing to return.

If you are spending a full day in the archaeological zone, a logical sequence is: morning at the catacombs and ruined basilica, then lunch in the Neapolis area or back toward the city center, then the Greek theatre and amphitheatre at Neapolis in the afternoon. Alternatively, pair the catacombs with a visit to Ortigia island in the evening, when the light on the old city is at its best.

Historical and Cultural Context: Why This Site Matters

Syracuse was one of the most important cities in the ancient Mediterranean. At its peak in the 4th and 5th centuries BC, it rivaled Athens in size and influence. By the time the catacombs were being dug, the city had passed through Greek, Roman, and then early Byzantine authority — and the Christian community that built these galleries was doing so in a city that had already been a major urban center for nearly a thousand years.

The reuse of the Greek aqueduct channels as the structural basis for the catacomb layout is a detail worth pausing on. The early Christian community did not start from scratch underground; they adapted what the city's Greek founders had already built for water management. It is a small but concrete example of the layered, reusing quality of Sicilian urban history, where each civilization tends to build not over but through what came before.

This same layered quality is visible across Syracuse more broadly, from the Greek temple columns embedded in the walls of the cathedral on Ortigia to the Roman amphitheatre cut into the same hillside as the Greek theatre at Neapolis. For travelers following the broader arc of Sicilian history, the catacombs are a useful link in the chain — connecting the ancient Greek city to the late antique Christian one.

Photography, Accessibility, and Practical Notes

Photography is generally permitted inside the catacombs, but flash and tripods are typically not allowed. The lighting inside is artificial and relatively dim in most areas. A smartphone with a capable low-light sensor will produce usable results; a mirrorless or DSLR set to high ISO will do better. The most photogenic moments tend to be where a tour guide's lamp illuminates a section of loculi against the darkness beyond — pure atmospheric contrast.

The site is not wheelchair accessible. The underground galleries involve stairs to descend, uneven tunnel floors, and sections with low ceilings. Anyone with mobility limitations should contact the site directly to understand what, if any, portions of the visit can be adapted. The ruined basilica above ground is accessible and worth seeing on its own even if the underground tour is not possible.

Children who are curious about history and comfortable in enclosed dark spaces generally find the catacombs engaging. Very young children or those prone to anxiety in underground environments may find it uncomfortable. There are no frightening theatrical elements — this is a serious archaeological site, not a novelty attraction.

For travelers building a wider Sicilian itinerary that includes other archaeological sites, the context offered here complements visits to the Valley of the Temples in Agrigento or the Selinunte Archaeological Park — all sites that chart different chapters of Sicily's layered past.