In 1999, residents of the state of Maine in America built the world's biggest ever snowman. He stood at 113ft tall.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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US scientists calculated that Santa would have to visit 822 homes a second to deliver all the world's presents on Christmas Eve, travelling at 650 miles a second.
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There are 13 Santas in Iceland, each leaving a gift for children. They come down from the mountain one by one, starting on December 12 and have names like Spoon Licker, Door Sniffer and Meat Hook.
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The tradition of putting tangerines in stockings comes from 12th-century French nuns who left socks full of fruit, nuts and tangerines at the houses of the poor.
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The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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