In the middle of the Juyongguan (pass) and Guangou Valley, there is the Cloud Platform gate, also known as the "Crossing Street Tower". It was built in 1342 during the Yuan Dynasty, and is made of white marble with a height of 9.5 metres (31 ft). There were originally three white pagodas atop the platform, giving it the name of "Crossing Street Tower". They were each destroyed in the transitional period between the late Yuan and early Ming Dynasties. In the early Ming Dynasty, a Buddhist Tai'an Temple hall was built on the platform. It was destroyed in 1702 during the Qing Dynasty.