People visit the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million.

People visit the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million.

People visit the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million.

People visit the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million.

A visitor takes photos in the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million.

People visit the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million.

People visit the Palace Museum in Beijing, capital of China, Dec. 22, 2018. The Palace Museum, also known as the Forbidden City, welcomed its 17 millionth visitors of this year recently. It's the first time that the number of its annual visitors has reached 17 million. (Photos: Xinhua/Li Xin)