There are 15 places on Earth where gravity seems to not work properly. These locations have been dubbed "gravity hills" or "mystery spots." In these spots, the laws of gravity seem to be defied, as objects roll uphill instead of downhill. Some people believe that these phenomena are the result of gravitational anomalies or magnetic forces. However, scientists argue that these illusions are simply a trick of perception, caused by the surrounding landscape and the brain's inclination to perceive things as level.