DİYARBAKIR Ongoing excavations at Zerzevan Castle , a 3,000-year-old military settlement from the Roman Empire, are unveiling new insights into the region's ancient history, with archaeologists anticipating the discovery of an extensive underground city. Perched on a 124-meter-high rocky hill near the Demirölçek neighborhood, 13 kilometers from Diyarbakır’s Çınar district, the castle gained international recognition in 2020 when it was added to UNESCO's World Heritage Temporary List . The site,