Mystery Spots and Gravity Hills

There are dozens of mystery spots to be found around the U.S., and many more gravity hills - places where gravity itself seems to be warped. Our perceptions of up, down, straight and crooked are confused by what some say are powerful gravitational anomalies and dizzying magnetic vortexes. Is that the case, or are our senses being fooled by clever man-made and natural optical illusions?

Here are just some of the more well-known locations: