Did you see the Season 3 premiere of Downton Abbey? Lady Mary's wedding dress was stunning, and true-to-period for the Edwardian Spoiler Alert! If you click-though this link you will also get to see Lady Edith's wedding gown (from later in the season).
Highclere Castle - Highclere Castle is a country house in the Jacobethan style, with a park designed by Capability Brown. The estate is in Hampshire, England, United Kingdom. This is where Downton Abbey is filmed.
Highclere Castle Floor Plan: The Real Downton Abbey