Colorful hot air balloons fill the skies of Zhangye Colorful Danxia Scenic Area of Zhangye, Gansu province. [Photo provided to gogansu.com]

Tourism in Zhangye Colorful Danxia Scenic Area of Zhangye, Northwest China's Gansu province, is witnessing a remarkable trend. 

This breathtaking destination welcomed more than 1 million tourist visits as of July 16, an increase of 442.83 percent year on year.