[InKunming--Yunnan] Tourists and local residents dance as a way of doing exercise on a square in the ancient town of Dukezong in Shangri-la City in Diqing Tibetan Autonomous Prefecture, southwest China's Yunnan Province, June 20, 2018. The ancient town of Dukezong, established more than 1,300 years ago, is known for its Tibetan-style architectures. (Xinhua/Yang Zongyou)

Tourists take photos in the ancient town of Dukezong in Shangri-la City in Diqing Tibetan Autonomous Prefecture, southwest China's Yunnan Province, June 20, 2018. The ancient town of Dukezong, established more than 1,300 years ago, is known for its Tibetan-style architectures. (Xinhua/Yang Zongyou)

Photo taken on June 20, 2018 shows a night scenery of the ancient town of Dukezong in Shangri-la City in Diqing Tibetan Autonomous Prefecture, southwest China's Yunnan Province. The ancient town of Dukezong, established more than 1,300 years ago, is known for its Tibetan-style architectures. (Xinhua/Yang Zongyou)

Photo taken on June 20, 2018 shows buildings in the ancient town of Dukezong in Shangri-la City in Diqing Tibetan Autonomous Prefecture, southwest China's Yunnan Province. The ancient town of Dukezong, established more than 1,300 years ago, is known for its Tibetan-style architectures. (Xinhua/Yang Zongyou)

Tourists walk around in the ancient town of Dukezong in Shangri-la City in Diqing Tibetan Autonomous Prefecture, southwest China's Yunnan Province, June 20, 2018. The ancient town of Dukezong, established more than 1,300 years ago, is known for its Tibetan-style architectures. (Xinhua/Yang Zongyou)

Photo taken on June 20, 2018 shows a night scenery of the ancient town of Dukezong in Shangri-la City in Diqing Tibetan Autonomous Prefecture, southwest China's Yunnan Province. The ancient town of Dukezong, established more than 1,300 years ago, is known for its Tibetan-style architectures. (Xinhua/Yang Zongyou)