Water appears to flow uphill, people seem to change height and trees grow at apparently strange angles in the Mystery Spot outside Santa Cruz, California.
Puzzling hundreds of thousands of visitors since 1940, the anomalies at this tiny attraction have been attributed to buried spacecraft, carbon dioxide, holes in the ozone layer and a magma vortex. The more logically minded explain that it is all just an optical illusion.
But whatever explanation visitors choose to accept, most find it fun and liberating to challenge the force of gravity for an hour or so. Others find the whole experience too nauseating to handle.
Similar mystery spots have since sprung up across the States, allowing more people the chance to walk on walls and watch balls roll up planks of wood.
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