The National Archaeological Museum of Egnazia is dedicated to Giuseppe Andreassi, director of the museum from 1976 t0 1985 and Superintendent to the Archaeological Heritage of Apulia from 1990 to 2009.

The museum is located outside the defensive wall of the circuit, fourth century B.C., that encloses the area of the ancient city Gnathia.

The museum, built according to chronological and geographical perspective, documenting the history of Egnazia, its transformations and its relations with other settlements in the southeastern regional context, starting from the first forms of population in the sixteenth century B.C., continuing with the development of the urban structure of the site and its monumental progressive in Messapian, Roman and Late Antiquity, until his retreat to the Acropolis, around the eighth century A.D., with a fortified settlement to life again in the XI-XII century.