Downton Abbey returns to PBS Sunday night at 9 (check local listings). The new season picks up in 1920.

Some things you didn't know about Downton Abbey

» Michelle Dockery AKA Lady Mary is a jazz singer.

» It costs an average of $1.6 million to produce an episode of Downton Abbey.

» Downton Abbey is really Highclere Castle in Hampshire, England. It's part of a 1,000 acre estate.

» Because there are so many people on set, the crew puts colored masking tape on the floor to show the actors where to stand in each scene.

» The starched, stiff collars on the mens’ costumes can be extremely painful -- they can even draw blood.

» Downton Abbey has won 18 awards -- a Golden Globe for Best Mini-Series Or Television Film and six Primetime Emmy Awards, including one for Outstanding Mini-Series.

» Elizabeth McGovern, AKA Lady Cora, is in the band Sadie & The Hotheads. Michelle Dockery AKA Lady Mary sometimes joins her for gigs.

» Lady Cora could have been played by Gillian Anderson. The actress admitted that she was offered the role of Lady Grantham -- but said no.

» The majority of the food used in the Downton Abbey kitchens is real. Which means that things like lobster get very smelly at the end of a long day of filming.

» Downton Abbey (Highclere Castle) was a home for evacuated children during World War II.

» When you see a letter, a magazine or a newspaper in a scene it was been created especially so it looks as authentic as possible -- even down to the handwriting.

» Downton Abbey is in the Guinness Book Of World Records as the only international TV series to receive the highest number of nominations in the history of the Emmy Awards -- with 27 in total.

» Downton Abbey is also listed in the Guinness Book Of World Records for receiving the 'highest critical review ratings for a TV show', beating Mad Men.

» Downton Abbey contains dozens of real antiques -- the mahogany desk and chair in the music room once belonged to Napoleon.

» Traditionally, people stopped using table cloths at dinner in the twenties, but the cast at Downton continue to so they can protect the antique tables.

» Jessica Brown-Findlay, AKA Lady Sybil, decided to try acting after an ankle injury caused her to give up professional ballet dancing.

» It’s so cold in Highclere Castle that in between takes the cast are often seen carrying hot water bottles and wearing puffa jackets.

» Jim Carter, AKA Mr Carson, performs magic tricks in between takes to keep the cast entertained.

» The Earl and Countess of Carnarvon currently live at Highclere Castle and it’s open to the public.