Completely a tourist trap. Your $9 entry fee pays for a guided tour through a farm with a completely fabricated story about "weird things happening" when the place used to be an apple orchard. Stand in certain places and see different man-made optical allusions which they say are natural occurences which defy the laws of physics.
The anti-gravity room is reportedly built atop a hill that defies gravity so then when you go into the room you see water that flows up and other oddities. However, if it were a natural occurance, why build a room?
Maybe it's supposed to be all in good fun. In that case, case kids will probably be thoroughly entertained; as for adults, it's tacky and cheesy.