Introduction to Tongtian Road: On the 100-meter cliff at the south end of Ladder Temple, there is a circular stone trough 50 meters long and 1.5 meters in diameter. It is named Pearl Stone because the walls of the trough are smooth. Through the Pearl Stone, it is There is a line of sky for only one person to pass sideways. After passing through the line of sky and going up, there is a stone kang of nearly 100 square meters. Legend has it that it was the resting place of Tieguai Li, one of the Eight Immortals, hence the name Tongtian Road.