“Downton Abbey” season six is set to conclude on Sunday (March 6) on PBS in the U.S.

You can watch the “Downton Abbey” finale episode trailer later below.

But before we bid our farewell to the hit drama series, here are six secrets that you have to know about the show that you have to know.

1.Why it was titled “Downton Abbey?”

Creator Julian Fellowes explained to The Star why the show was titled “Downton Abbey” instead of “Downtown Abbey.”

He said it has something to do with his great-grandfather.

“I have always been rather an admirer of my great-grandfather, Professor John Wrightson … He had an estate in Wiltshire called Charford Manor and I thought of calling the series ‘Charford Abbey,’ but we decided it was too near Cranford, and so we settled on ‘Downton’ after Downton College of Agriculture …“

2. Why “Abbey”?

“I called it ‘Abbey’ after Ramsey Abbey, a Fellowes house in Huntingdonshire. I didn’t want to call it ‘Downton Park’ as, coupled with ‘Gosford Park,’ I think I would have been known as the Park Keeper,” said Fellowes.

3. Will there be season seven?

According to Seattle Times, executive producer Gareth Neam was asked a couple of years ago about how long the series will run. He said: “There are only seven stories, and I think the challenge with a long-running TV show is to retell those seven stories without anyone noticing. But there could come a time where we’ll be going, ‘What do we do now?’”

4. “Downton Abbey” The Movie

Neame told Forbes magazine that a possible spin-off film of “Downton Abbey” is something they are thinking about.

“The film is something we’re considering.  We’re having very early conversations, but there are no firm plans. I hope the film does happen, I don’t want (the series) to be completely over,” he said.

5. “Downton Abbey” Special

The two-hour season finale special presented by PBS will not be the end of the Crawleys’ household saga because another special feature is in the works, Oregon Live reported. The project, titled “More Manners of Downton Abbey,” will discuss the transition of the aristocratic family into the 1920s. Alastair Bruce will be playing a major part of this show.

6. Last day at the set 

The cast revealed that their last day of filming has been an emotional one for everyone.

Actor Kevin Doyle, who played Joseph Molesley, revealed to Entertainment Weekly that everybody on the set was crying.

“The thing about actors is that we’re so used to being with a group of people for a certain amount of time and then moving on. We’re used to saying goodbye. I think we all thought we’d be able to manage with it. Then on the last day, it all caught us by surprise. It was very emotional, actually. Everybody was crying. Jim was one of the first. [Jim Carter walks by.] Yeah, I am talking about you.”