Segesta was one of the major cities of the Elymians, one of the three indigenous peoples of Sicily. The hellenization of Segesta happened very early and had a profound effect on its people.
On a hill just outside the site of the ancient city of Segesta lies an unusually well preserved Doric temple. It is thought to have been built in the 420s BC by an Athenian architect, despite the city not having a large Greek population. The temple has six by fourteen columns on a base measuring 21 by 56 meters, on a platform three steps high. Several elements suggest that the temple was never finished. The columns have not been fluted as they normally would have been in a Doric temple and there are still bosses present in the blocks of the base (used for lifting the blocks into place but then normally removed). The temple also lacks a cella, any ornamentation, altar or deity dedication, and was never roofed over. The temple escaped destruction by the Carthaginians in the late 5th century.
References:The Roman Theatre of Mérida is a construction promoted by the consul Vipsanius Agrippa in the Roman city of Emerita Augusta, capital of Lusitania (current Mérida). It was constructed in the years 16 to 15 BCE. One of the most famous and visited landmarks in Spain, the Roman Theatre of Mérida is regarded as a Spanish cultural icon and was chosen as one of the 12 Treasures of Spain.
The theatre has undergone several renovations, notably at the end of the 1st century or early 2nd century CE (possibly during the reign of Emperor Trajan), when the current facade of the scaenae frons was erected, and another in the time of Constantine I (between 330 and 340), which introduced new decorative-architectural elements and a walkway around the monument. Following the theatre"s abandonment in Late Antiquity, it was slowly covered with earth, with only the upper tiers of seats (summa cavea) remaining visible.