China’s Longyou Caves span over 30,000 square feet with ceilings towering 100 feet high, the scale of these man-made caverns is nothing short of mind-bending.

China’s Longyou Caves span over 30,000 square feet with ceilings towering 100 feet high, the scale of these man-made caverns is nothing short of mind-bending.

Every inch of these walls features precise, uniform chisel marks that shouldn’t have been possible with the tools available in this so-called time period.