Fourth-century coin and mysterious inscriptions found under Notre Dame cathedral: "Dig of the century"

Updated on: June 2, 2026 / 6:45 AM EDT

/ CBS/AP

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Wilting in the summer sun, a line of tourists waits to climb Notre Dame cathedral and meet its gargoyles.Four meters (13 feet) beneath them, a team of archaeologists is digging the other way - straight down and back in time, to Roman Paris 2,000 years ago.In 2019, fire brought Notre Dame's spire crashing down as the world watched. The cathedral was rebuilt and reopened in late 2024, and now Paris wants to soften the hot, bare square in front of it with trees and shade.But in a city this old, the soil cannot be turned until what lies beneath it is excavated, in case it is damaged during works.So a slice of Notre Dame's forecourt has become an excavation site - an open pit ringed by barriers and crossed by a wooden walkway, a few steps from the line-up.A modern Da Vinci CodeFrench media have dubbed it the "dig of the century.""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 Altenburg, a conservator with the Paris archaeology unit, told The Associated Press.

Among the hundreds of objects already found: a fourth-century coin stamped with the face of the Emperor Constantine, and shards of medieval pottery painted on the inside with marks no expert has yet deciphered — like a modern Da Vinci Code.