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 ''
Denmark 's Rabjerg Mile is the largest migratory dune in northern Europe . Giant dune has swallowed up buildings including a medieval church and lighthouse accommodation . The area doubled as a desert in 1915 silent film `` The Secret of the Sphinx ''