The head office is located in the former Palace of Graphic Arts, which was built on the Montjuïc hill for the 1929 Barcelona International Exposition.

The pavilion was initially to be dismantled once the event was over, but it was conserved and refitted by the architect Josep Gudiol before the museum opened its doors in 1932.

The museum was designed by Pelagi Martínez i Patricio, covers an area of 4,000 m2 and is structured into five chronological spaces: prehistory; protohistory, the Greek and Phoenician colonisations; the Roman Empire; and, finally, the Visigoths, marking the start of the medieval period.

[7] It was relocated on several occasions until it arrived at its current location in the Benedictine monastery of Sant Pere de Galligants in 1857.

Visitors can walk around the ruined walls and cobbled streets of the village, as well as visit the Ullastret Monographic Museum, which is also part of the complex.