A Behind the Scenes Look at the New Season of Downton Abbey

'Mysteries of the Castle: Beyond Downton Abbey,' visits one of Britain's greatest homes from the hit series.
3:00 | 12/26/13

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Transcript for A Behind the Scenes Look at the New Season of Downton Abbey
Showing off all day. The beauty shots in the british isles where you spent your entire summer, getting to meet the folks of "downton abbey." In addition to taking you behind the scenes of the hit series in tonight's "20/20" special, we go inside some jaw-dropping castles in great britain, to show you what it is like to live as an aristocrat in 2013. Just how does the other half live? You might be very surprised. Here in this beautiful castle, lives one of scotland's most prestigious and ancient families. The duke of argyle. As in argyle socks. He wears them. Just one step below royalty. He is the head of the clan campbell, the largest in scotland. A man of many titles. Did you say 26 titles. 26. 27, I think. Reporter: You lost count? He's also a dad. The father of three, small children. His wife, eleanor, who grew up a cadbu cadbury, as in chocolate, met the duke when she was 18. I look at that castle. He's come over the bridge. And that first glimpse, pretty impressed. Reporter: And who knew one day, you would be living in those walls. Who knew? Certainly not me. Reporter: It's a house that should look familiar to "downton abbey" fans. It was the location used in last season's finale. They all came. They arrived in their carriages and their cars. Nice to have two. I have three. I don't want to be -- Reporter: The duke's family tree stretches back hundreds of years. That's a picture of my grandfather. This is me being page to the queen. Reporter: Page to the queen? Not bad as a first job. What was that like? Terrifying. But quite fun at the same time. Reporter: You carried the queen's train? It was amazing. You got paid. I bought my first bicycle. Reporter: And it wasn't his last job. Elephant polo, anyone? We got 1-1. It was ecstatic. I became captain of the scottish elephant polo team. Reporter: Who knew there was one? I didn't. Of the more than 1,500 great estates in britain, more than half are open to the public. Advertising for weddings, tours and conferences. They also rent out as film sets. The duke of argyle said he lobbied to bring "downton's" producer. They came in through the garden, through there, into here. Reporter: There's no doubt the exposure on the series has paid off. Fantastic. All of the publicity. Reporter: I loved your idea, though. Possibly putting a cut-out hole. You, too, can be part of "downton abbey." It would funny. If it helps keep it operational. They are working it. The duchess of argyle is in the gift shop. Signing books. They have to keep the castles afloat. They cost millions and millions every year, just to run. And beautiful, as well. It is such a great part of their history. They want to keep it alive. And they want to keep it in their family. On "downton abbey" they're always struggling to keep the thing afloat. Everybody has bills. Yeah. Those are just larger. I want to make sure everybody watches tonight eshgs a special two-hour broadcast called "mysteries of the castle." At 9:00, 8:00 central. 8:27.

This transcript has been automatically generated and may not be 100% accurate.

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