The site of the Yacimiento Arqueológico Gadir is divided into different levels, corresponding to the different periods of occupation of the settlement of Gdir which is historically one of the oldest of Phoenician character in the West. On the site you can distinguish the paved layout of the streets, houses and tools of the 9th century BC. All these constructions were built following what is called earth architecture, that is to say, made mainly with mud and clay. The site is certainly one of the best preserved so that the streets were paved with clay at the same time as the first buildings were built. Fossil traces of numerous cattle that crossed these roads are also visible.

The undisputed protagonist of the site is undoubtedly Mattan, a Phoenician citizen who died during a great fire in the sixth century BC and of which some remain are an important part of the theme of the itinerary.

In addition to these Phoenician remains, the buildings of a Roman factory for the processing of fish have also been preserved, with its tanks for the conservation of fish in brine.