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When did the modern restoration of the Parthenon begin?

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The Parthenon temple in Athens, Greece, is illuminated at night, showing its iconic Doric columns and partially ruined structure atop the Acropolis. — Parthenon Night view of the Parthenon, Athens.

The modern, multi-decade restoration of the Parthenon began in 1975.12

This project was initiated following earlier, unsuccessful restoration efforts led by engineer Nikolaos Balanos, which had inadvertently caused further damage to the structure. The 1975 campaign focused on returning every salvageable piece of marble to its original position, while filling gaps with new stone sourced from the same quarry used by the ancient Athenians. This meticulous, time-consuming restoration process spanned more than 40 years.12