WENNINGSTEDT, GERMANY - JULY 19: Incoming waves wash away footprints left by visitors in the sand along a beach on Sylt Island on July 19, 2016 near Wenningstedt, Germany. Sylt Island, with its long stretches of sand beaches and its protected dune landscapes, is among the most popular holiday destinations, especially for wealthy visitors, along Germany's North Sea coast. Many Germans, unsettled by the recent terror attacks in countries like France and Turkey, are choosing to vacation in Germany this summer.  (Photo by Sean Gallup/Getty Images)