25. A SECRET CODE MESSAGE
One of the most significant archaeological mysteries in the U.S. is a rock that has symbols which no one can decipher. The Judaculla rock was detected in North Carolina at the Caney Fork Creek valley in Jackson County, outside of Cullowhee. The symbols consist of scribblings, markings, and spidery lines. The symbols are about 10,000 years old, and it’s a mystery because no other rock in the area has the same markings. The pictographs reveal animal tracks, human figures, suns, and geometric figures.