Netherlands
No trail to follow, no signposts marking your way and once you've set off there is no way back. If not one of the best hikes in Europe, this is definitely an experience of a lifetime: join a guided mud walk from the mainland to one of the off shore islands in the north of the Netherlands. Challenged by the upcoming tide, you wade through the mud and cross hip deep watercourses making you realise you are actually walking on the bottom of the sea. When you’re surrounded only by the sound of the wind and the sea birds it is not hard to see why the Wadden Sea was inscribed on UNESCO's World Heritage List.