Mobile photo shows a tourist taking selfies on the circular ramp inside the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows tourists walking on the circular ramp inside the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows tourists walking on the circular ramp inside the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows a tourist visiting the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows a tourist walking on the circular ramp inside the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows people taking a rest at the Phoenix Square of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows people walking along the corridor inside the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)

Mobile photo shows tourists visiting the building of Phoenix Center in Beijing, capital of China, Aug. 23, 2019. (Photo: Xinhua)