Such places are typically optical illusions caused by the local terrain. If you were to make proper measurements with good land surveying instruments, you would find that the cars and the water are simply moving downhill, but IT LOOKS LIKE things are moving uphill due to the surroundings. Quoting from the Wikipedia entry on Gravity Hills: "The most important factor contributing to the illusion is a completely or mostly obstructed horizon; without a horizon, judging the slope of a surface is difficult as a reliable reference is missing."There's an example here in Canada called Magnetic Hill in New Brunswick and there are many other examples of such gravity hills around the world.
faire un petit don à science.ca.