SINCE its premiere in April 2011, fantasy drama Game of Thrones has become the world’s most popular television show. But while millions of fans sit back and enjoy 10 one-hour episodes each season (unless they are among the 86,000 who apply to be one of 5,000 background extras), the show’s creators spend the rest of the year bringing it all to life.HBO, the American cable network responsible for this and other hit shows including Boardwalk Empire and True Detective, created a special half-hour documentary to highlight three locations of the latest season: Dubrovnik (Croatia), Seville (Spain) and Belfast (Northern Ireland)."Although this is TV, it’s TV on a scale that is beyond anything else," said Duncan Muggoch, a line producer for Croatia and Spain (what they call the "southern locations" for Game of Thrones season five)."And even though last year was big, this one’s even bigger."Of course, working with 166 cast members and more than 1,000 crew members on 151 sets presents challeng...

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