He saw huge pictures cut into the ground below. They were drawn by the Nazca Native Americans around 200bc. As well as pictures of animals, there are also 13,000 absolutely straight lines etched into the rock. Some of them are more than 32km long. A theory has been put forward that the Nazcan people could fly.
Evidence shows that they had the technology to put together a hot-air balloon.
So the Nazcans may have been able to organise the drawing up of the lines and figures from the air. But the theory has yet to be proved. Some people think the lines are landing directions for spacecraft. Others believe they are maps of the stars, used by the Nazcan people to tell them when to plant and harvest their crops. Between 1980 and 1991 strange shapes suddenly began appearing in farmers' fields in the south of England.