Introduction to Tongxin Locks: The densely packed "Tongxin Locks" that lock each other tightly have become a dazzling scenery on Sheshen Cliff. It is said that if lovers lock a heart-to-heart lock here, their love will last forever; if relatives lock a heart-to-heart lock here, the family will love each other and be happy forever. There are many locks here, and the oldest lock is more than 100 years old.