Just down the street on your left—Rue Rouget de l’Isle—you’ll find the entrance to the Horreum, a fascinating monument dating back to the 1st century BC. In Roman times, a horreum was a warehouse used to store all sorts of goods: grain, wine, textiles—you name it. Common throughout the Roman world, the first horrea were built in Rome in the 2nd century BC, and by the end of the Roman Empire, the great capital had nearly 300 of them. Here in Narbonne, you can still see part of the ancient horreum just a few meters down the street. While the above-ground structure is long gone, the underground level remains, and it’s been open to the public since 1975. You can wander through three surviving underground galleries, located about five meters below street level. It’s a rare and very well-preserved glimpse into Narbonne’s Roman past—and one of the last horrea of its kind still visible today. Expect to pay a small entrance fee, but it’s definitely worth the visit!