Viking cruise ships to satisfy tourists' mystery and curiosity about the "Black Forest", specially arranged a detour into the Black Forest Mountains during the itinerary. Legend has it that many armies entered the Black Forest in ancient times, just like entering the Ecstasy, and never came out again. From now on, people's awe of the Black Forest became more profound and became synonymous with mystery. The snow filled the Black Forest, even seeing the beautiful "fog pine", was an unexpected surprise.