> In the dry lakebed of Racetrack, Death Valley stones as big as 700 pounds mysteriously slide across the surface of the earth without any notable external forces acting upon them. While some researchers believe a combination of natural events, such as wind and ice, cause these stones to “sail”, others question this theory pointing out that the stones don’t follow a predictable path and change directions abruptly.
> Nazca LinesOn an isolated, arid plateau in southern Peru, the wind almost never blows. In this place, around the year 400 to 650 AD, the people of the Nazca culture began to remove the red stones covering the ground, leaving the white earth beneath visible. The art they created is phenomenal. Whilst some of the designs are simple lines, over 70 of the “Nazca lines” are detailed animals such as llamas, monkeys, fish or birds, with the largest designs over 200 m across. How did a primitive civilization achieve such precision artwork on such a grand scale, when they had no way of viewing their accomplishments from the air?