Christmas tree ornaments are seen during a media preview of the 2017 holiday decorations at the White House in Washington D.C., the United States, on Nov. 27, 2017. Some 150 volunteers from 29 states spent more than 1,600 hours to finish the decorations including 53 Christmas trees and more than 12,000 ornaments. An estimate of 25,000 visitors are expected to tour the White House for the Christmas holiday. (Xinhua/Yin Bogu)