Introduction to Yuxu Palace: The full name is "Xuantian Yuxu Palace". Founded in the 11th year of Yongle in the Ming Dynasty (AD 1413), it was once the largest unit among the ancient buildings in Wudang Mountain. Later, most of them were destroyed in the 10th year of Qianlong reign of the Qing Dynasty (AD 1745). Some of the existing buildings and ruins include four "turtle stele" pavilions weighing one hundred tons.