Photos of Christmas trees and lighting ceremonies everywhere from the White House to Bulgaria.
The National Christmas Tree is lit in front of the White House during its lighting ceremony in Washington December 1, 2011. (Reuters/Molly Riley)
President Obama, first lady Michelle Obama and their daughters Sasha and Malia along with mother-in-law Marian Robinson at the annual National Christmas Tree Lighting in Washington. (AP Photo/Haraz N. Ghanbari)
The Christmas tree in Trafalgar Square after its lights were switched on in central London, December 1. (Reuters/Olivia Harris)
Fireworks light up the night sky near the giant Christmas Tree display in Puerto Princesa, Palawan city, west of Manila December 1. REUTERS/Romeo Ranoco