in the Olympeion field On the other side of the road running through the Golden Gate of the ancient city, is a plain commanded by the huge Olympeion field. This includes a
platea with a large temple to Olympian Zeus, plus other areas still under investigation. These include a sanctuary, with remains of a paved square, a complex
sacellum ("holy enclosure") and a
tholos. This, after another gate, is followed by a sanctuary of
chthonic deities, an archaic sanctuary, the so-called
colimbetra (where was a still unknown gate) and the tip of the spur where the sanctuary is located, with the Temple of Vulcan. The Olympeion complex' main attraction is the huge Temple of Olympian Zeus, which was described with enthusiastic words by
Diodorus Siculus and mentioned by Polybius. Today it is reduced to ruins due to destruction begun in antiquity and continued through the 18th century, when the temple was used as a quarry for the port of
Porto Empedocle. Near the south-western corner of the temples is a small edifice (12,45 × 5,90 m) with two naves and a deep pronaos, a double entrance and what has been identified as an altar. Its dating is controversial, though scholars have assigned it to the Archaic era, due to the discovery of numerous 6th century BC vases. Also archaic is another
sacellum, which later was replaced by a classical edifice. These are followed by the scant remains of a temple (called "Tempio L") dating to the mid-5th century BC, measuring 41.8 × 20.20 meters, to which, in the 3rd century BC, a Hellenistic entablature was added. ==Temple of the Dioscuri==