The Amazing Gravity Hill!
This one is located in Braga, north of Portugal. A gravity hill is a “place where the layout of the surrounding land produces the optical illusion that a very slight downhill slope appears to be an uphill slope. Thus, a car left out of gear will appear to be rolling uphill.”
http://www.metacafe.com/watch/1074616/car_climbing_a_slope_with_engines_off/