Fodor's Expert Review Hallein Salt Mine
The second-largest town of the region, 15 kilometers (10 miles) south of Salzburg, Hallein was once famed for its caves of "white gold"—or salt. "Hall" is the old Celtic word for salt, and this treasure was mined in the neighboring Dürrnberg mountain, which you can now visit in the form of Hallein Salt Mine. It's the oldest salt mine in the world and probably also the most fun: you get to explore the subterranean world by foot, boat, and even slide. You can get to Hallein by regular bus, by car, or by bicycle alongside the River Salzach, then it's a lovely, 40-minute walk (or seven-minute taxi) up to the mine.