Archaeologist have found sophisticated pre-Incan sculptures made in the shapes very similar to that of airplanes, jets, helicopters and space shuttles. These small gold figurines are approximately two inches in length and estimated to date between 500 and 800 BCE. Some archaeologists have suggested that the figures depict animals, however, this seems most unlikely. Another interesting note is the wings of the aircraft have small ornamental drawings on them, many in the form of spirals. To the ancient Indians of South America these spirals represented ascending and descending.
These can be evidence of many things. Could be a representation of birds, or higher Incan intelligence of technology. Or even UFOs.