Longyou Grottoes: 2,000-year-old Chinese site with uniform machine-like tool marks. Over 40 massive caves excavated inside sandstone hills in China Average cave floor area over 1,000 square meters (American football pitch size) Cave heights up to 30 meters (10-story building)
In China lie 24 massive caves carved into sandstone hills. Average size: over 1,000 sq meters. Heights reach 30 meters. Tool marks show 60cm-wide bands of parallel slanted striations. Mystery: no oil lamps or torches were found inside. How did workers excavate without lighting?
Key Facts
- Over 40 massive caves excavated inside sandstone hills in China
- Average cave floor area over 1,000 square meters (American football pitch size)
- Cave heights up to 30 meters (10-story building)
- Tool marks consist of 60cm (2ft) wide bands with parallel slanted striations
- No oil lamps or torches found inside caves - no explanation for how work was done without lighting
- Tool marks stay at consistent angles even at inner corners
- Long continuous horizontal lines between layers appear gratuitous for excavation purposes
- Artifact found inside dated to Stone Dynasty (10th-13th century)
- Similar to 20th century salt mine marks in Ukraine but without horizontal separation lines
- Pre-dates modern era metal tools
Related site: Longyou Grottoes — view location, images, and history on the Ancient Nerds map.
Source: Megalithic Mystery: Ancient Machine Marks vs Hand Tool Marks by Curious Being