Two Thousand Years of Paris History Uncovered Beneath Notre Dame

Remarkable Discovery Emerges from Cathedral Renovation

Just four meters beneath the bustling tourist queues at Notre Dame Cathedral, archaeologists are uncovering an extraordinary time capsule spanning two millennia of Parisian history. French media have dubbed it the "dig of the century" , and this remarkable excavation is a direct consequence of the cathedral's devastating 2019 fire and subsequent restoration efforts.

Following the devastating blaze that saw Notre Dame's spire collapse, the cathedral reopened in late 2024. As part of wider urban renewal, Paris aims to transform the currently stark square into a shaded, tree-lined space. However, before any landscaping could begin, archaeologists needed to carefully excavate what lay beneath the surface to protect invaluable historical artifacts.

Lead archaeologist Camille Colonna is overseeing this unprecedented dig, which has transformed a section of the cathedral's forecourt into an open pit ringed by barriers and crossed by a wooden walkway, a few steps from the line of tourists. The excavation reveals distinct historical layers compressed within just 13 feet of earth, creating a vertical timeline of human civilization.

Layers of History Tell Paris's Ancient Story

The most prized discoveries come from the deepest levels, where Roman-era Paris once thrived. In Roman times, the town was called Lutetia, and its centre lay across the river, on the Left Bank. As the Roman empire collapsed, people pulled back to the Ile de la Cite, where Notre Dame would later rise, and fortified the island with walls of stone taken from earlier buildings.

Evidence of this ancient recycling has emerged in fascinating ways. Ms Colonna's team found some proof: a Roman doorstep found in the dig, taken from a much bigger building, carried over, turned upside down, and laid in a road as paving. This discovery illustrates how medieval residents repurposed Roman structures, creating a physical link between civilizations separated by centuries.

Digging down, her team has reached their cellars — and therefore also the time in history they represent. Below them lie Merovingian and Carolingian grain pits, from the sixth to the 10th centuries; below those, darker and deeper still, a dense Roman quarter from the fourth and fifth centuries. At the cathedral's birth in 1163, the entire square was packed with medieval houses, split by a single street , creating the urban landscape that archaeologists are now methodically uncovering.

Treasures from Medieval Waste Dumps

Among the most remarkable finds are a fourth-century coin bearing the image of Emperor Constantine and fragments of medieval pottery featuring mysterious markings that experts have yet to decipher. These shards are particularly intriguing, featuring faint, undeciphered markings painted on their interior – a mystery that has led some to liken it to a "modern Da Vinci Code".

Surprisingly, the richest discoveries come from the most unlikely source. The richest finds here come from the foulest place: the deep pits beneath the medieval houses, old latrines that doubled as rubbish dumps. Out of them the team keeps lifting whole jugs and cups — thrown away centuries ago, yet still intact among broken plates and animal bones. It is "rare to find complete ceramics", said Valentine Breloux, an archaeologist with the unit. The soft organic waste acted as a protective cushion, preserving these artifacts in pristine condition for modern discovery.

A Living Museum Beneath the City

This excavation represents more than academic curiosity; it's transforming how people understand Paris itself. "It's a rare opportunity for us to work on something that's tangibly going to make a difference to the history of Paris," Lucie Altenberg, a conservator with the Paris archaeology unit, told the Associated Press. The dig has captivated both experts and tourists, offering a tangible connection to the city's ancient past.

As one archaeology student observed while watching the excavation, "Here you can see the layers — medieval Paris, Roman Paris, maybe even before that. It makes the city feel less like a postcard and more like something still being discovered." This sentiment captures the profound impact of seeing history literally unearthed beneath one of the world's most famous landmarks.

Once the archaeological work concludes, Paris will proceed with its plaza renovation, adding 160 trees and improved walkways while preserving views of the cathedral's iconic facade. The artifacts will join the city's vast archaeological collection, but the knowledge gained from this excavation will permanently enrich our understanding of how Paris evolved from a Roman settlement called Lutetia into one of the world's great capitals. This dig proves that even in our modern age, the past continues to reveal its secrets to those patient enough to listen.