During the golden age pericles started building what?
From Plutarch's biography of Pericles (http://classics.mit.edu/Plutarch/pericles.html ):
"That which gave most pleasure and ornament to the city of Athens, and the greatest admiration and even astonishment to all strangers, and that which now is Greece's only evidence that the power she boasts of and her ancient wealth are no romance or idle story, was his construction of the public and sacred buildings."
"Phidias had the oversight of all the works, and was surveyor-general, though upon the various portions other great masters and workmen were employed. For Callicrates and Ictinus built the Parthenon; the chapel at Eleusis, where the mysteries were celebrated, was begun by Coroebus, who erected the pillars that stand upon the floor or pavement, and joined them to the architraves; and after his death Metagenes of Xypete added the frieze and the upper line of columns; Xenocles of Cholargus roofed or arched the lantern on top of the temple of Castor and Pollux; and the long wall, which Socrates says he himself heard Pericles propose to the people, was undertaken by Callicrates."
(The long wall was a walled corridor that connected the city of Athens to the port of Athens.)