This temple was constructed on a mostly artificial spur. It dates to c. 450 BC, measuring 38.15 x 16.90 m: it is in Doric style, peripteros 6 columns wide by 13 long, preceded by a pronaos and opisthodomos. The basement has four steps.
Current remains (including anastylosis from the 18th Century onwards) consist of the front colonnade with parts of the architrave and of the frieze. Only fragments of the other three sides survive, with few elements of the cella.
The building was damaged in the fire of 406 BC and restored in Roman times, with the substitution of clay marble roof tiles with ones and the addition of a steep rise in the area where today can be seen the remains of the altar. Nearby are arcosolia and other sepultures from Byzantine times, belonging to the late 6th century AD renovation of the Temple of Concordia into a Christian church.