Tourists view the making of walnut cakes at Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province, April 12, 2014. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)

Tourists visit an old street at Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province, April 12, 2014. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)

Tourists visit an ancient bridge at Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province, April 13, 2014. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)

Tourists visit an old street at Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province, April 12, 2014. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)

Tourists visit an old street at Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province, April 13, 2014. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)

Photo taken on April 13, 2014 shows an panoramic view of the Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)

Photo taken on April 13, 2014 shows an panoramic view of the Qingmuchuan Town, Ningqiang County, northwest China's Shaanxi Province. Qingmuchuan Town of Ningqiang County lies in the border area of Shaanxi, Gansu and Sichuan provinces. With its beautiful natual scenery and well-preserved ancient streets, the town became a popular tourist destination recently, especially after a TV series shot here which made it more famous. Over 100,000 tourists visited Qingmuchuan during the Qingming festival holidays this year. (Xinhua/Tao Ming)