People celebrate 100th anniv. of U.S. National Parks system

People hold umbrellas while assembling into a living version of the National Park Service's iconic emblem to celebrate the 100th anniversary of the U.S. National Parks system, near the Washington Monument on the National Mall in Washington D.C., the United States, Aug. 25, 2016. The National Park Service turns 100 on Aug. 25, 2016. (Xinhua/Bao Dandan)