Tourists relax at the Shenandoah National Park in Virginia, the United States, Nov. 3, 2018. Some 121 kilometers from the bustle of Washington, D.C., the Shenandoah National Park rises above the Virginia Piedmont to its east and the Shenandoah Valley to its west. Tens of thousands of living creatures make their homes in the park, from black bear resting beneath rock overhangs, to tiny aquatic insects. (Xinhua/Liu Jie)