Described as a "gravitational anomoly," the Mystery Spot sits in California's Redwood Forest. The tourist spot challenges basic laws of gravity and physics; objects roll uphill and visitors lean over their toes without falling over.

The explanation behind this illusion is two-fold. The Mystery Spot sits in a particular part of the Redwood Forest where the trees grow crooked, creating an environment that is titled. The spot's wooden house is also slanted. Visitors mistakenly use this house and the surrounding environment to judge movement — instead of the horizon — which is what causes their misperceptions.