The first recorded use of a Christmas tree was in the 16th century, when Martin Luther, a German monk, is said to have brought a pine tree inside his house and decorated it with candles. Since then, the tradition of decorating a Christmas tree with lights and ornaments has become a beloved part of the holiday season. In fact, it's estimated that over 30 million Christmas trees are sold in the United States alone each year. As for who originally came up with the idea of a Christmas tree, that's still a mystery. Some believe it was inspired by ancient pagan traditions, while others think it was influenced by the