Tourists visit the ancient town of Taierzhuang in east China's Shandong Province, Feb. 16, 2019. (Photos: Xinhua)

Photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Tourists visit the ancient town of Taierzhuang in east China's Shandong Province, Feb. 16, 2019.

Photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Tourists visit the ancient town of Taierzhuang in east China's Shandong Province, Feb. 16, 2019.

Photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Aerial photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Aerial photo taken on Feb. 16, 2019 shows the night view of the ancient town of Taierzhuang in east China's Shandong Province.

Performers spray molten iron to entertain visitors at the ancient town of Taierzhuang in east China's Shandong Province, Feb. 16, 2019.