Watch full movie online. A Ken Burns-style documentary exploring the first 100 years of our National Christmas Tree. On Christmas Eve 1923, President Calvin Coolidge lit the first National Christmas Tree on the Ellipse, just south of the White House. We follow the tree through its first 100 years, where it served as a backdrop to many events in our nation's history. We meet the designers and learn their process of lighting our federal fir each year.