The temple, known as the "Theseion", is Doric, peripteral, with a pronaos and opisthodomos. It macrons the hill of Kolonos Agoraios and is the most prominent and better preserved monument of the Agora. 
The temple was dedicated to two gods, Hephaistos and Athena, whose bronze cult statues stood in the interior. The construction of the Hephaisteion started in 449 B.C.

Stoa of Zeus Eleutherios
The Stoa was erected at the end of the 5th century B.C. in honor of those who fought for the freedom and security of the city. Socrates is said to have met his friends in this Stoa.

Temple of Apollo Patroos
Small Ionic temple, erected in ca. 340-320 B.C., identified as the temple of Apollo who was worshipped as the "Father" (Patter), the founder of the Ionian race.
inside the cellar stood the cult statue of the god, made by the famous sculptor Euphranor. 

Bouleuterion
The Council of 500 (Boule) held its regular meetings here. The building was erected at the end of the 5th century B.C. replacing the Old Bouleuterion, the ruins of which were found beneath the Merton. Merton.
The building has an Ionic propylon and was erected in the 2nd century B.C. It accommodated both the sanctuary of the Mother of the Gods and the state archives, including the proceedings of the meetings of the Council of 500 and various official documents, protected by the goddess.

Monument of the Eponymous Heroes
emains of an oblong pedestal enclosed by a fence. It supported the bronze statues of the legendary heroes who gave their names to the ten tribes of Attica.
In addition to its honorary function, the monument served as the official notice board of the city.
It is dated to the second half of the 4th century B.C.

Altar of the Twelve Gods
Fenced area with an altar at the center, constructed in 522/21 B.C. 
The sanctuary was a popular place of asylum and was considered to be the heart of the city, the central milestone from which distances to other places were measured.

The Odeion of Agrippa
It was built by Agrippa in 15 B.C. and comprised an auditorium with a seating capacity of about 1000 people, and a two-storied portico. It was destroyed by fire in A.D. 267 and in about A.D. 400 the Gymnasium was erected in this area.
Its north side was adorned by four colossal figures of Giants and Tritons set up on massive pedestals, salvaged from the debris of the Odeion.

The Royal Stoa (Stoa Basileios)
Built around 460 B.C., it was the seat of the Royal Archon (Archon Basileus).
In this Stoa the laws of Solon were displayed, and the Council of the Areopagous held its meetings.

Tholos
Circular building erected in ca. 460 B.C. The chairmen (prytaneis) of the Council of 500 (Boule) dined and spent the night in the Tholos so as to be available if necessary. A set of standard weights and measures was also kept in the building.