The Longyou caves in China are really intriguing. They are a series of large artificial sandstone (argillaceous siltstone of Cretaceous age) caverns located on Phoenix Hill, near the village of Shiyan Beicun (Shiyanbei) on the Qujiang River in Longyou County, Quzhou (Yazhou) prefecture, Zhejiang (Zhejing) province, in Eastern China. The Longyou Caves have been asserted as the ninth miracle in China after the Great Wall and the Tomb of the Emperor of the Qing Dynasty. In spite of this, there is no record at all of this monumental construction, what might indicate that they are very, very old. They are about an hour drive from Jinhua City.
