Gobi Desert
Newfound Google Earth images have revealed an array of mysterious structures and patterns etched into the surface of China's Gobi Desert. According to experts, this is a secret military base, and the structures are used for a variety of purposes including weapons testing, spy satellite calibration and testing of radar instrumentation. The most elaborate feature, an intricate grid of perfectly straight lines that weave back and forth every few hundred feet for 20 miles (33 kilometers), is most likely a Yagi antenna array, a device used for weather tracking and other atmospheric research.