The Spanish caves of Gruta de las Maravillas can be found in Aracena, Spain, and are jaw-droppingly spectacular.
But there's also a secret cavern that they don't like to mention and where no photos are allowed.
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It's known as 'The Naked Room' and is home to hundreds of naturally formed structures that look surprisingly like penises.
Some sneaky tourists have snapped a photo, but it's hard.
The caves are open 365 days a year - will you be visiting?
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A trip to New York isn't complete without a glimpse of the Statue of Liberty yet take a closer look and you'll spot that this isn't the real Lady Liberty or views of the Big Apple at all but a fake of the world-famous attraction in Tokyo. In fact, there are hundreds of versions of the statue around the world.
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Replica sites come in all forms, from copycat UNESCO World Heritage monuments to whole towns modelled on picturesque places. We've rounded up a few of our favourite fakes, from Nevada's take on Stonehenge to Portugal's Christ the Redeemer. Would you visit any of these fake tourist attractions?