Introduction to Haitangyu: Haitangyu is a 35-mile-long canyon, where green walls stand tall and mountains reach into the sky, which is daunting. Every midsummer, wild crabapple flowers bloom all over the canyon, and their fragrance overflows. Browsing along the bottom of the valley, you will be dazzled by dozens of unique sights such as the dangerous "Tiger's Mouth", the narrow "Line of Sky", the lifelike "Looking Back Guanyin", the large-scale "Xia Tianqiao" and "Shang Tianqiao".