The Sanctuary consisted of :
Theatre : It is dated at the end of the 3rd c. B.C. or the beginning of the 2nd c. B.C. and was built for the needs of the musical and theatrical games which were held in the Valley during the festival of the "Mouseia" devoted to the 9 Muses. Spectators sat on the seats cut in the mountain slope. Only the first row - the prohedria - was marble. Nowadays preserved are the "skene" and the "proskenion".
Long ionic stoa (length 96,70 m.) on the west of the small temple which housed the votive offerings to the Muses. It is dated in the 3rd c. B.C. Originally it had an internal wall and rooms; the former was replaced later by collonade in the Corinthian order.
Small temple or altar of the Muses: It is a small rectangular building dated in the same time-period as the theatre and the stoa, in 3rd c. B.C. It was revealed after the demolition of the church of Ayia Triada which had been built upon the ancint foundations.
Bases of the statues of the Muses: During the excavations there were found 9 bases of the statues which originally stood in a single group. On 5 of them - on the most well preserved - were inscribed names of Muses and epigramms, works of the poet and sculptor Onestos.
The square tower of Askra of the 4th c. B.C. which crowned the hill Pyrgaki and dominated the Valley from the N. It had 3 store-rooms on the ground floor. Earlier circuit wall, now ruined, enclosed the tower. It was probably built by the Thespian a little before 371 B.C. ( battle of Leuktra ) to control the movements of the Thebans.