The spot was discovered in the early 1950s by 3 surveyors when their equipment wasn't working correctly. In a 300 foot section of land, everything always pulled to the East, even when the level showed that it was level. They soon named it "The Mystery Spot".
Millions have visited since it has been turned into a tourist attraction. If you are ever in the area, I recommend you stopping and checking it out. It is definitely something out of the ordinary, and if you have kids, they will love it!
Images from: http://www.roadsideamerica.com/story/29062
For more information on the Mystery Spot check out their web page: http://www.mysteryspotstignace.com/