is the best preserved example in the world of Greek military architecture: the (Timolean) city walls. The length unearthed (almost 400 m) dates to the 4th century BC. The feature that makes them unique is the large squared blocks in Calcarenite 3 m high in the lower part and a thick layer of raw or sun-dried clay bricks above which were perfectly preserved. The upper layer was probably added as a quick solution after news of the imminent invasion of the Carthaginians. At some points the walls externally reached a height of almost 10 m. They are considered to be one of the most important discoveries of classical archeology of the twentieth century as they are testimony of the importance that the ancient Greeks gave to defensive design and engineering as they were designed by an architect down to the smallest detail, with devices and structures intended for specific purposes such as protection from weather and towers, stairs, walkways, drains, buttresses. Inside the walls the military district was brought to light with buildings of clay bricks. Not far away, a large residential area of the same era was discovered. The Acropolis extends between the mouth of the Gela and the Pasqualello valley and contains the ruins of houses, shops, temples and the Hippodamian road system (with the plateia and the stenopoi). The sacred area extended to the north: today only the bases of three temples are visible. Of the largest, temple C or Athenaion, a Doric-style column (almost 8 m high) remains standing and is one of the city's symbols. Until 405 BC the acropolis housed the most important sacred buildings of Gela but after the destruction by the Carthaginians, houses were built over the acropolis after the rise to power of Timoleon. In the Bosco Littorio, south of the Acropolis, the extensive emporium (VII-VI century BC) complex near the port at mouth of the river has been recently brought to light and restored. The emporium included workshops, warehouses and shops. A grandiose Hellenistic villa has been found in via Romagnoli (predio Iacona). The Greek baths of Gela in via Europa are unique in Sicily and consist of two rooms; the one located to the north west consists of two groups of bathtubs connected by a wastewater system that surrounds a central space. The bathtubs that make up the first of the two groups are arranged in a horseshoe and