http://agathe.gr/guide/odeion_of_agrippa.html
Odeion of Agrippa Late in the 1st century B.C. the Athenians were given money for a new marketplace by Caesar and Augustus, and the northern half of the old Agora square was filled with two new structures, ... Entry to the Odeion was either from the upper level of the Middle Stoa on the south or through a modest porch at ground level on the north (Fig. 53).
