The Parthenon temple — built in the 5th century BCE to honour the goddess Athena – was partially destroyed during a Venetian bombardment in 1687, then looted.
Its fragments are scattered throughout many renowned museums.
The sculptures, also known as the Elgin Marbles, were taken from the Parthenon temple at the Acropolis in Athens in the early 19th century by British diplomat Thomas Bruce, the earl of Elgin.
Earlier this year, three marble fragments of the Parthenon temple that had been held by the Vatican for centuries were returned to Greece.