GPS doesn\'t just help you to determine your location on a digital map - it can also map out things you didn\'t know were there. Like parts of the Great Wall Of China.
A two-year study by China\'s State Administration of Cultural Heritage (SACH) and State Bureau of Surveying and Mapping (SBSM) used infrared and GPS to map the Great Wall - and found that it is around 3,850 km longer than originally thought, according to the China Daily.
The newly-discovered sections, previously concealed by rivers, trenches and hills, stretch from northern Liaoning province to western Gansu province, and were built during the Ming Dynasty, which governed China from 1368-1644.