Denmark 's Rabjerg Mile is the largest migratory beach in northern Europe . The dune has swallowed up buildings including a medieval castle and tourist attractions . So it 's a surprise to discover a sand dune the size of a small desert roaming around the countryside unchecked , destroying farmhouses , churches , roads and anything else that gets in its way . The area doubled as a location in the silent film ` ` The Secret of the Sphinx ''
Denmark 's Rabjerg Mile is the largest migratory beach in northern Europe . The dune has swallowed up buildings including a medieval castle and tourist attractions . The area doubled as a location in the silent film ` ` The Secret of the Sphinx ''