If you came through the main entrance, the first section of antiquities you will see is the Bouleuterion, which was the Council House Square of Ashkelon when it was an autonomous city-state under Severius in the 3rd century AD. The sunken area with descending steps on the right, which resembles a courtyard, is actually the inside of a Herodian assembly hall. There is also a statue of the goddess Isis with her god-child Horus. These figures, made of marble imported from Italy, were sculpted some time between 200 BC and 100 AD. Behind the Bouleuterion lies a fine amphitheater, well worth the five-minute walk.

Along the southern edge of the park are segments of wall from the 12th-century Crusader city. The most peculiar feature of the site is the assembly of Roman columns sticking out of the ancient Byzantine sea wall on the beach. Originally these columns were used to support the walls, which were destroyed in 1191 by Salah ad-Din. Richard the I Jon-Hearted partly restored them in 1192, as did Richard Cornwall in 1240, only to liave them finally demolished by the Sultan Baybars in 1270.