Hot air balloons float above the Colorful Danxia Scenic Spot in Zhangye, Gansu Province, giving visitors unparalleled views of the rainbow-like terrain. Danxia is a unique landform in China, characterized by red stone and multicolored cliffs and ridges. At the foot of the Qilian Mountains, shades of red, light green, brown, and white unfurl across the hillside, formed by eons of erosion. In recent weeks, the scenic spot has seen a boom in tourism, a testament to the popularity of northwest China's summer attractions.