Horreum Romain museum. Narbonne. France. The Horreum is the only building dating from classical times that can still be seen in Narbonne. It is a former underground warehouse and dates from the end of the first century BC and was probably the below-ground section of a market. Two of its galleries can be visited and the sound and light show that has been installed creates an atmosphere rather like that of a market-day. Stone remains have been put on display in the alcoves that open off the north