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Light candles in the windows
In Nordic countries, candles are placed in windows on December 24 to guide visitors, in memory of the wandering of Mary and Joseph on the evening of the Nativity. The people of Lyon do this on December 8, in honor of the Immaculate Conception. (Just be cautious about open flames -- or use flameless candles!)

© Timo Newton-Syms | Flickr | CC BY-SA 2.0