Secret tunnel city stretching 985ft below Rome is uncovered after vast labyrinth was sealed more than a century ago

The Irish Sun

26-07-2025

A STUNNING piece of Rome's past has been uncovered after being sealed off more than a century ago.
This network of dimly lit tunnels under the Capitoline Hill could soon become the latest attraction in the history-rich city.
5
Work is now underway that will see them become another must-visit site
Credit: CNN
5
The tunnel network had been an integral part of the city since the days of Ancient Rome
Credit: CNN
5
Artefacts that were discovered during past excavations are being brought down to the complex
Credit: CNN
5
The secret underground city covers some 42,000 square feet under the Ancient Roman Forum
Credit: CNN
"No one has seen these
The secret underground city covers some 42,000 square feet under the Ancient Roman Forum - and reaches depths of 985 feet below the surface.
Known as the Grottino del Campidoglio, these tunnels were mostly
But work is now underway that will see them become another must-visit site for Rome's tourists.
read more in world news
It is expected to be
Before they were sealed off, the tunnel network had been an integral part of the city since the days of Ancient Rome.
They were further developed in the Middle Ages and were in use as recently as the 1920s.
"The area has never before been opened to the public as it will be," D'Ambrosio told CNN.
Most read in The US Sun
"It was utilised by the population, used as warehouses, shops, taverns, but never as a site to visit as it will be."
The tunnels bear signs of the one thriving communities they housed, including shops, taverns and restaurants.
Erling Haaland rocks bold outfit as Man City star enjoys day out in Rome with girlfriend Isabel Johansen
Some parts of the network are lined with bricks, which the broadcaster says shows signs of development and use in the 19th century.
Work to make the tunnels ready to receive tourists and visitors is currently underway.
Archaeologists had used laser scanning to map the spaces through out the vast complex.
"The proposed interventions are aimed, on the one hand, at safeguarding the monument, through the restoration and safety of the structures, and, on the other, at enhancing its accessibility and usability, which is currently extremely limited," a spokesperson for project lead Insula architecture group said.
"The Campidoglio Grottoes project envisions conservative restoration and enhancement of the underground passageways and cavities that wind through the hill, crossing it in various directions and on multiple levels."
This work includes managing the release radon gas, which comes from the area's volcanic rock.
It will see specialist filters installed at the site to ensure it is safe.
There will also be a museum space on the upper level, as well as disabled access for visitors.
Artefacts that were discovered during past excavations are being brought down to the complex so they can be studied there.
"To an archaeologist everything is interesting," D'Ambrosia told CNN.
The tunnels are believed to have had a wide range of uses throughout their long and fascinating history.
They are said to have first been used as stone quarries and then as water cisterns - before featuring residential and commercial structures.
In one part of the tunnels, it is even possible to see the foundations of the Temple of Jupiter.
5
There will also be a museum space on the upper level, as well as disabled access for visitors