How is the Parthenon still standing?

The careful placement of precisely cut masonry ensured that the Parthenon remained essentially intact for over two millennia. Although some of the sculptures were removed when the building was converted to a Byzantine church, the structure survived—even during its later transformation into a Roman Catholic cathedral and then a mosque. Indeed, it did not become a ruin until 1687, when, during the bombardment of the Acropolis by Venetians fighting the Turks, a powder magazine stored in the temple exploded and destroyed the centre of the building. The Venetians then inadvertently smashed several sculptures while attempting to remove them as loot, and Thomas Bruce, Lord Elgin, later brought a substantial portion of the surviving sculptures to England. After Greece gained independence from the Ottoman Empire, efforts were made to restore the building, but the campaign headed by engineer Nikolaos Balanos proved to have caused more damage, and in 1975 a multi-decade restoration began. Each salvageable piece of marble was returned to its original position, while gaps were filled with new marble from the same quarry the ancient Athenians had used. The time-consuming project lasted over 40 years.