Located near the village of Shiyan Beicun in Zhejiang province, China, lies the Longyou caves – an extensive, magnificent and rare ancient underground world considered in China as ‘the ninth wonder of the ancient world’.  The Longyou grottoes, which are thought to date back at least 2,000 years, represent one of the largest underground excavations … Continue reading The Mysterious Man-Made Caves of Longyou: 10 Unanswered Questions