When archeologist Hiroyuki Miyagi heard that a bunch of ancient Roman and Ottoman coins had been unearthed from the ruins of an old castle in Okinawa, he initially thought it was a hoax. "I couldn't believe they'd found coins from the Roman empire in Kasturen castle," Miyagi, who works at Okinawa International University, told CNN. "I thought that they were replicas that had been dropped there by tourists.Read more on NewsOK.com