Gravity Hill (Franklin Lakes, N.J.)
Gravity hill on the Ewing Avenue exit of Rt. 208 South has one of those "ghost child" stories attached to it. The legend says explains the reason cars appear to roll uphill in defiance of gravity is because the ghost of a little girl pushes them that way. The little girl was killed by a passing car when she dashed into the road to fetch a ball. Anyways some kind of anomalous magnetic field also causes balls to roll up the hill instead of down.

Mystery Hill (Blowing Rock, N.C.)
The Mystery House is considered to have a stronger-than-normal gravitational pull to the north. Here a person can apparently stand at a 45-degree angle and balls can be shown to roll up an incline. Here one can also see some other optical illusions and puzzles.

Cosmos Mystery Area (Rapid City, S.D.)
Located just six miles from the Mount Rushmore National Monument, the Cosmos Mystery Area on Hwy. 16 features a house where no one appears to be able stand up straight. Even a ball placed on a plank will appear to roll up it. As claims the promotional literature: "You can even stand on the wall!".

Gravity Hill (Salt Lake City, Utah)
It is located a few blocks northwest of the Capitol building in Salt Lake City. The road leading down into a canyon is the place where gravity works against known physics. Stop at the bottom of the hill here and put your car in neutral, the car will coast back uphill out of the canyon. A legend goes that someone named Elmo is buried in the area, and his gravestone glows blue at midnight. And it is believed that the force of this ghostly presence that warps gravity.