UFOs aren’t necessarily from aliens; UFO means unidentified flying object. UFOs are also thought responsible for making crop circles. Some artists use planks attached to rope or barrels to push down the crop but this breaks the stem. In real crop circles the stems are melted use the same energy waves as microwaves. England is the most UFO-abundant place in the world. Some scientists believe that Mayans, Ancient Egyptians, and other ancient tribes built giant buildings with the same architectural design. The giant boulder these people used to build these amazing feats weighed sometimes several tons. One of the only ways they could have done this is if the had help from others with very advanced tools.