It takes 7,200 lights, 1,200 baubles, 600 sparkly twigs and an army of people to get our trees up and ready before opening.
See how this year's decorations are inspired by Leonardo: Experience a Masterpiece:
Winter wonderlands and the original Christmas story
Leave the crowds behind and escape to a snowy street in Paris or learn how different artists have painted scenes of the Nativity through history:
Monet painted this Snow Scene at Argenteuil during the particularly snowy winter of 1874/5. Rather than focus on detail, Monet gives a sense of the atmosphere of an overcast afternoon with the sun slowly fading from the sky.
That same winter, fellow Impressionist Alfred Sisley painted this scene of The Watering Place at Mary-le-Roi. His rough brushwork suggests he painted it quickly, outdoors, in one sitting.
Almost 100 years earlier, Romantic painter Caspar David Friedrich also limited his range of pigments for his snowy Winter Landscape. He creates a shimmering translucent mist by carefully stippling with the point of a brush using smalt, a blue pigment that contains glass and is transparent in an oil medium.
Eat, drink and be merry...
... with a special three-course festive menu at the National Café from £35 per person.
In the heart of the West End, we're perfectly placed for post-Christmas shopping or pre-panto dining. Oh yes we are!
Christmas in Trafalgar Square
Nelson isn't Trafalgar Square's only resident celebrity; every December the city's favourite Christmas tree arrives from Norway. This year, for the first time, it's joined by a festive market in the Square.
Find out more about what's on in Trafalgar Square.