Hundreds of lights set the U.S. Capitol's Christmas tree aglow in Washington, D.C. Mark Thiessen/Corbis
    An evergreen tree, often a pine, balsam, or fir, decorated with lights and ornaments as a part of Christmas festivities. The use of evergreen trees, wreaths, and garlands to symbolize eternal life was a custom of the ancient Egyptians, Chinese, and Hebrews. Tree worship was common among the pagan Europeans and survived their conversion to Christianity in the Scandinavian customs of decorating the house and barn with