ATHENS, GREECE—Part of the flat-topped rock that supports the 2,500-year-old Parthenon is crumbling, according to engineers from the Central Archaeological Council who examined the Acropolis after the fall of a boulder of “considerable size” last January. According to Phys.org, the team found “instability over a wide area,” probably caused by rainwater drainage from the old Acropolis museum. The southern slope of the hill that supports the Parthenon will have to be reinforced. To read about how ancient Greeks viewed their own past, see ARCHAEOLOGY's "Monuments and Memory."