Really a number of excellent attractions in one, Hallstatt Salt World lies high above the town on the 1,030-meter-tall Salzburg (Salt Mountain). 

Accessible by cable car or a three-minute journey aboard the funicular railway, it's well worth visiting for the wonderful views from the Skywalk, a viewing platform extending over a sheer drop with Hallstatt 350 meters directly below. 

More spectacular views are from historic Rudolf's Tower (Rudolfsturm), an old fortification built to defend the mines against invaders, now a restaurant and observation tower.