Introduction to Baoshan Tower: Baoshan Tower is a seven-couplet long building that spans between the summer and autumn mountains. The long corridor in front of the building is like an arm, embracing the two mountains in the chest, hence its name. The corridor of Baoshan Tower is like a sky bridge flying in the sky. Walking along the corridor, it seems that you have spanned two different seasons. It is jokingly called the "time and space tunnel" by modern people.