The Horreum in Narbonne, France dated back to the first century BC and are a network of subterranean tunnel and passageways which were thought to have been used as storage rooms during the Roman era.
These unique underground tunnels would once have formed part of the city of Narbo Martius, which was the capital of the Narbonne region during Roman times.
It is believed these tunnels were used as the storage area for the local market and today the site boasts a sound and light show which is designed to replicate the atmosphere of such an ancient marketplace.