Sounio is famous for the temple of Poseidon, but the Athenians constructed also a temple dedicated to Athena. As the Greek myth goes, these two deities competed each other for the position of the patron of Athens; Athena won for her gift of olives to Attica.
The temple is contemporary of the Poseidon's temple, constructed at the middle of the fifth century BCE. Regrettably the foundation is the only remain.
The photo above was shot from the entrance of the sanctuary toward the temple of Athena. The photo right is the temple of Athena; right being the façade of the temple (to the East). The cella is 5.9m by 3.8m, and the four angles were supported by four columns arranged in a square.
Vitruvius recorded its unusual plan, i.e. the external columns were arranged only on the eastern (façade) and southern sides.
There are the capitals I found at the rear of the temple.
In the first century CE, the temple was demolished and some of the parts were reused to construct the South-East Temple in the Athenian Agora. One of its Ionic columns is exhibited in the Stoa of Attalos (= Agora Museum).
In the sanctuary of Athena, there is also a smaller Doric (distyle prostyle) temple (in the photos right and below). It is thought to be dedicated to the hero Phrontis, who is a character in Odyssey of Homer, and was believed to have buried here after his death on the ship of Menelaos. According to another theory, the temple is of Artemis, and the circular mound behind (you can somehow recognise in the photo below) is the tomb of Phrontis.
In the photo below, the gray stone at the middle is the base of the cult statue.
