Trivia: A subtle reference to this film's 3D format: In Max's box, Trevor finds a pocket stereoscope, which are funky looking glasses that create the illusion of a three-dimensional image from two-dimensional photographs. It was invented by Sir Charles Wheatstone in 1840.
Trivia: There really are, believe it or not, such things as magnetic rocks.
Trivia: This is one of three 2008 movies with this same title. This one stars Brendan Fraser. There is a version starring Greg Evigan and another version starring Ricky Schroder. Not only are the casts different, but they also have different plots.
Answer: A mountain.