TOKYO -- Japanese researchers said on Thursday that they had found 100 more drawings on Peru's Nazca plateau, whose giant etchings dating up to 2,500 years ago are one of archaeology's greatest mysteries.
The new images on the World Heritage Site include both straight lines, as have been discovered for the past century, and abstract images that are difficult to make out.
"We confirmed them by analyzing satellite photos and actually visiting there in March," said Masato Sakai, assistant professor at Yamagata University in northern Japan.
The Nazca Lines, many of which can only be seen from the sky, were believed to have been etched on the ground between 500 BC and AD 500.
The reason why ancient people traced the lines remains one of archaeology's greatest mysteries. The most common theory is that the drawings were used for rituals, while believers in extraterrestrials have cited them as evidence of alien spacecraft landings.
Most of the newly-found designs were in the southern part of the Nazca plateau, which is away from the major tourist area to the north where hundreds of images have been discovered, Sakai said.
One of the satellite pictures showed a figure, 65 meters (215 feet) long, which looks like an animate being with two horns. The team believes that the image is related to good harvests.
The gigantic geoglyphs, some 400 kilometers south of Lima, include representations of animals, flowers and plants but are mostly abstract. The site was put on UNESCO's World Heritage list in 1994. The team plans to publish its findings in a science magazine in Peru.