Uproxx reports production has started on the 'Game of Thrones' prequel series, and it's filming in a familiar location. The long-beloved HBO series came to a close on May 19, when ?The Iron Throne? aired. Entertainment Weekly reports that ?filming has quietly begun on the untitled follow-up, which is shooting a pilot this summer in hopes for a series order." The shooting location is Northern Ireland, which served as the hub of production for the entire run of 'Thrones'. The anticipated new series stars Naomi Watts and Miranda Richardson, and is set thousands of years before the events of Game of Thrones.