For centuries, Rome has been called the Eternal City—a place where history is not just remembered, it is layered. Every cobblestone, column, and fountain sits atop the remnants of earlier eras. But even in a city where the past is literally underfoot, few discoveries have sparked as much excitement as the recent unveiling of a forgotten subterranean labyrinth beneath Capitoline Hill.
This sprawling underground world, sealed for more than a hundred years, is now poised to become one of Rome’s most intriguing new attractions. Archaeologists call it the Grottino del Campidoglio—and its story is as complex as the city above it.
A Labyrinth Lost To Time
Beneath the political heart of ancient Rome, workers and historians have uncovered a hidden network of tunnels, rooms, and passageways stretching over 42,000 square feet and plunging nearly 985 feet below the surface. This is not just a single corridor or forgotten cellar—it is a complete underground city in miniature.
The tunnels date back to multiple eras, reflecting the city’s long and layered history. Portions of the site were once part of the Temple of Jupiter, Rome’s most important religious building during the Republic. Later, in the Middle Ages, parts of the underground area were repurposed as storerooms, shops, and even taverns. In the 1920s, it was used again—this time as a secure storage and utility network—before finally being sealed and left untouched for decades.
The result is a time capsule where stone walls, ancient steps, and faded frescoes coexist in remarkable preservation.
From Sacred Temple To Daily Life
What makes the Grottino so fascinating is its mix of the monumental and the mundane. Archaeologists have identified sections that were clearly tied to grand ancient structures, including supporting foundations and storage areas linked to the Temple of Jupiter. This was once a space that literally held up Rome’s religious and political center.
Yet just a few steps away, there are remnants of more everyday activities: tavern counters, amphora fragments, and what appear to be shopfront storage spaces. It is a rare glimpse into how ancient Romans—both the elite and the working class—moved through the same shared physical spaces, albeit in very different ways.
Why It Was Sealed
The tunnels did not disappear because they were forgotten—they were deliberately sealed. In the early 20th century, structural concerns, flooding issues, and changing urban needs led authorities to close off much of the underground network beneath Capitoline Hill. Over time, the entrances were bricked up, and public memory of the site faded.
Ironically, that very closure may have saved the site from damage. Without constant human traffic, pollution, or modern renovations, many features have survived far better than similar spaces elsewhere in Rome.
Opening To The Public
The city of Rome has now committed to an ambitious restoration project, aiming to open the Grottino del Campidoglio to visitors by late 2026 or early 2027. The plan includes:
- Stabilization and safety upgrades to ensure the tunnels are structurally sound.
- Restoration of key historical features, from ancient stonework to faded wall decorations.
- Accessible pathways so visitors of varying mobility levels can explore parts of the site.
- A dedicated museum space to display artifacts found within the tunnels and explain the site’s history.
When complete, the underground city will offer a walk through time—from the Roman Republic to the Middle Ages, the Fascist era, and the modern day.
A New Attraction For The Eternal City
Rome already boasts a stunning array of underground wonders, from the Catacombs to the subterranean ruins beneath San Clemente Basilica. But the Grottino del Campidoglio stands apart for its sheer size and location—it lies directly under one of the most historically significant spots in the city.
For tourists, this promises a new perspective on a familiar skyline. You will be able to stand in Piazza del Campidoglio, admire Michelangelo’s 16th-century redesign of the square, and then descend into a world that predates it by more than a thousand years.
For historians and archaeologists, the site is a living laboratory. Its multi-era construction means experts can study how Romans adapted their built environment over centuries—reusing, reinforcing, and reimagining spaces as the city’s needs evolved.
Tips For Future Visitors
While the tunnels will not open to the public for another couple of years, here is how to prepare if you are adding this experience to your future Rome itinerary:
- Book in advance – As with the Colosseum’s underground tours, capacity will likely be limited.
- Wear comfortable shoes – Expect uneven surfaces and long walks through dimly lit spaces.
- Consider a guided tour – The site’s significance lies in its layers of history, best explained by an expert.
- Plan for cool temperatures – Underground areas in Rome stay cooler year-round, even in summer.
Why This Discovery Matters
Rome’s history is not static—it is constantly being rewritten with each excavation. The Grottino del Campidoglio reminds us that the city still holds secrets, even in places we thought we knew completely.
It is also a testament to Rome’s unique challenge: how do you preserve a city that is simultaneously a thriving modern capital and the largest open-air museum in the world? Each new discovery brings both opportunity and responsibility.
When visitors finally step inside this underground labyrinth, they will not just be seeing stone walls and ancient passageways—they will be walking through the story of Rome itself, written over thousands of years, and rediscovered just in time for a new chapter.
