Nazca Lines

The geoglyphs etched into the Nazca Desert between 500 BC and 500 AD -- covering 450 square kilometres with figures of animals, plants, and geometric shapes up to 370 metres long -- are so large they can only be fully appreciated from the air, creating one of archaeology's enduring mysteries about their purpose. UNESCO inscribed them in 1994, and the Peruvian government built a metal viewing tower over three figures; however, the lines can only be fully seen by taking a light aircraft flight over the pampa.