For centuries, the salt on which Salzburg's rulers based their wealth was mined in Salzburg's Dürrnberg. Today, an adventurous journey through the history of that "white gold" awaits you at Salzwelten: from the beginnings of the Celtic miners through the Dark Ages to modern mining. The fast-paced wooden slides and the winde-ranging tunnels, which you explore led by an experienced guide, provide an added dash of action. The raft trip across the mystical underground salt lake takes you into the dazzling world of baroque Salzburg. And along the way, you will cross the only subterranean international border between Austria and Germany.