Downton Abbey
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2. Downton Abbey
In case you've been living under a gigantic rock for the past few years, Downton Abbey is the biggest British costume drama since, well, the last big costume drama. Spanning the idyllic pre-war era through the storms of The Great War and beyond to the roaring 1920s, Downton Abbey tells the story of the aristocratic Crawley family and the servants who work for them. A must-watch.