Do you remember how it all started? When the Titanic went down, Lord Grantham lost his immediate heirs and his daughter Mary lost her fiancé, throwing Downton Abbey and its servants into turmoil. The new heir turned out to be Matthew, a lowly lawyer with novel ideas about country life. Downton Abbey, the award-winning series from Julian Fellowes, went on to tell the 12-year story of a great English estate on the cusp of a vanishing way of life. Now, all six seasons of the wildly popular series are available to stream with PBS Passport.