The first known temple at the sanctuary - dating to the late 6th century BCE - rests on a low rock spur south of the river and is aligned toward the east on a foundation measuring c. 11 by 20 m. Little is preserved beyond partial lower courses and cuttings in the bedrock for the same. There are a few remains of the architecture that allow a certain identification of the temple as being of the Doric order. The Persians destroyed the sanctuary structures in 480 BCE and took the cult statue back to Susa. The temple was reconstructed in the 420s BCE. Although the temple is poorly preserved, it can be reconstructed to have had four columns in the cella and an adyton at the rear of the cella. The presence of an adyton is asserted for the temple of Artemis at Loutsa (Artemida) 6.1 km to the north and the temple of Artemis at Aulis 67 km northwest. This feature may also be shared by the 6th century BCE Temple of Aphaea on Aigina. Schwandner links the shared feature of an adyton with a common, regional practice in the cult of Artemis. There is disagreement on the question of the temple having been hexastyle-prostyle (6 columns across the front only) or distyle in antis (2 columns between projecting walls) in plan. There is a stepped retaining wall on the northern side of the temple platform, which may be the steps mentioned by Euripides.