 On 26 September a Venetian mortar round, fired from the Hill of Philopappos, blew up the magazine, and the building was partly destroyed.The explosion blew out the building's central portion and caused the cella's walls to crumble into rubble.Greek architect and archaeologist Kornilia Chatziaslani writes that "...three of the sanctuary’s four walls nearly collapsed and three-fifths of the sculptures from the frieze fell.