On a small peninsula in the present-day municipality of Palamos, on a hill, in the 6th century BC, the Iberians built a small village that was to become the most important fortified settlement on the Indigetes tribes after Ullastret. Located in an area that offered excellent conditions for control and defence, it developed its economy through trade with the Greek city of Empúries.

It reached its peak between the 4th and 3rd centuries BC. At this point, the settlement was fortified on the side with easiest access to the peninsula, the isthmus. The first urban development took place on the highest part of the settlement. To increase the available land on the slopes of the hill, terraces were constructed with reinforced retaining walls on which the streets and houses were built. Today, these can still be seen on the eastern side. It seems that at the top of the fortified summit, or acropolis, there was a Hellenistic temple of which the remains of the entrance portico and the foundations of the columns have been found.

With the Romanisation of the area, the settlement of Castell did not disappear. Its strategic location led to it experiencing new heights in the 2nd century BC. The settlement was extended to the north, beyond the walls, occupying what, until then, had been an area of silos. In addition to new houses, a porticoed square, surrounded by commercial premises, was created.

The archaeological site of Castell is of great significance, both for the architectural techniques employed and for the state of preservation of the remains. And this is because a large proportion of the structures remain, even some walls more than 1.5 metres high. Almost the entire wall can be seen, as well as rooms, streets, water cisterns and silos for storing grain.