Ιερά Απόλλωνος Δειραδιώτη & Αθηνάς Οξυδερκούς, λόφος Ασπίδος Άργους

On the western slope of the hill, several sanctuaries were established during the historical period on four successive terraces, dedicated to Apollo Deiradiotes (or Pythios) and Athena Oxyderkes. The earliest use of the area dates to the 8th century BCE, while its main architectural development took place between the Archaic and Hellenistic periods (6th–3rd century BCE). The sanctuary of Apollo likely included a stone temple with Doric and Ionic columns located on the central terrace, accompanied by a monumental altar to the east and auxiliary structures such as a stoa, oracle, and water reservoirs to the north. The complex has been interpreted as an Asclepieion, while the northeastern terrace contained a peristyle building with rooms, a covered cistern, and an underground water channel. On the eastern terrace, remains of a circular structure suggest a tholos associated with the sanctuary of Athena Oxyderkes. In the early 6th century CE, a three-aisled early Christian basilica was constructed over the remains of the temple of Apollo, and the entire hill was fortified during the Classical period.