"I picked up bottles and cigarette butts more than 1,000 times last year."

Shan Jixiang, curator of the Palace Museum, talks about the need to improve public awareness of the importance of protecting relics to stop tourists from littering. The museum has been under great pressure to protect relics and ensure visitors' safety as 153.4 million trips were made to the palace last year, a year-on-year growth of 9 percent.