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The cave of the forbidden cult

High on a ridge outside Valencia, a cave mouth opens onto what was once a secret place of worship — so charged that religious authorities once tried to erase it for good. Today only a handful of hikers know the stone path that climbs up to it: a vertigo-inducing balcony over an entire valley, with no signage, no guided tours, and no tourists in sight. Save it for late afternoon when the light spills across the valley, and you'll understand why locals don't hand this one out easily.