Longyou Grottoes

　　The Longyou Grottoes were discovered in June 1992. Surveys revealed that 36 caves of varying sizes are distributed across a 0.38-square-kilometer earthen mound. These caves range from 1,000 to 3,000 square meters in area. Each cave extends vertically downward from a rectangular entrance, reaching a height of about 30 meters, with a dome-shaped ceiling in an inverted funnel form. Inside the caves, three to four massive “fish-tail shaped” stone pillars are scientifically arranged, blending seamlessly with the cave roof. The cave walls, ceilings, and pillars are uniformly marked with chisel marks that appear to have been made with decorative intent by the ancients. The temperature inside the caves remains a constant 18 degrees Celsius year-round, while the surrounding area features lush green hills, clear waters, bamboo forests, and ancient trees.

　　Due to a series of questions regarding the historical background, scale, purpose, and underground engineering techniques used in the excavation of the Longyou Grottoes, they have drawn attention from both the public and academic circles worldwide. Experts have proposed various theories, including those suggesting they were ancient quarries, royal tombs from the Spring and Autumn Period, military bases of the Yue Kingdom, remnants of extraterrestrial civilizations, Han Dynasty storage facilities, or Taoist blessed lands. However, none of these theories have been fully substantiated or widely convincing. The mystery of the Longyou Grottoes remains unsolved, sparking endless speculation and intrigue, making it an enduring enigma that attracts tourists from around the globe. The Longyou Grottoes are a national key cultural relics protection unit and have been recognized as a China Cultural Tourism Boutique Scenic Area, one of Zhejiang’s Fifty Must-Visit Attractions, one of Zhejiang’s Ten Most Beautiful Summer Sceneries, and one of the Most Dynamic Scenic Areas, among other accolades.