12 Machines Powered by Natural Phenomena
Some early and modern machines work by using forces already present in nature.
Ancient machines
12 Machines From History That Worked on Unknown Principles
This listicle features ancient and historical machines that still puzzle researchers because their functions or inner workings remain unclear.
18 Machines That Ran Without Known Power Sources
From ancient mechanisms to modern enigmas, certain machines appear to function without any clear external power supply. Whether they relied on hidden energy sources, lost technologies, or misunderstood science, their operation continues to spark fascination and debate among researchers.
12 Machines Found in Archaeological Sites
Ancient civilizations built complex machines that reveal their ingenuity, from water-lifting devices to automata and computational instruments.