The Vatican has been putting Christmas trees in St. Peter’s Square for 42 years, but this year’s Tannenbaum could land the church on the naughty list. Environmentalists have appealed to the pope to intercede and prevent the church from chopping down a 200-year-old fir tree that has been chosen as the highlight of the holiday decorations.

The tree will be decorated with 50,000 LED lights.

Ever wonder how Rockefeller Center picks its tree? Or where the tree's lights are stored during the offseason? Or if the tree in your yard might be selected? Here are the answers to 25 questions about the world's most famous Christmas tree.