Hekatompedon
Proper noun
Meaning
(historical) The Temple of Athena upon the Acropolis, formerly in the location of the present Parthenon.
(historical) The specific chamber within the Parthenon which contained the cultic chryselephantine statue of Athena.
Source: en.wiktionary.orgExamples
Probably, the Hekatompedon was built where the Parthenon now stands.