Gaisberg and Untersberg
Salzburg's "house mountains" are so called because of their proximity to the city, with Gaisberg lying to the east and Untersberg to the south.
To reach Gaisberg, you can take the Albus No. 151 bus from Mirabellplatz right up to the summit of the mountain, where you'll be rewarded with a spectacular panoramic view of the Alps and the Alpine foreland. From here, there are several hiking trails and a charming little pub-restaurant with sun terrace. The bus leaves six times a day weekdays and 12 times a day weekends and takes about a half hour.
The Untersberg is the mountain Captain von Trapp and Maria climbed as they escaped the Nazis in The Sound of Music. In the film they were supposedly fleeing to Switzerland; in reality, the climb up the Untersberg would have brought them almost to the doorstep of Hitler's retreat at the Eagle's Nest above Berchtesgaden in Germany. A cable car from St. Leonhard, about 13 km (8 miles) and a 30-minute bus ride south of Salzburg, whisks you up to a height of 5,830 feet for a breathtaking view. In winter you can ski back down the Untersberg (you arrive in the village of Fürstenbrunn and taxis or buses take you back to St. Leonhard); in summer there are a number of hiking routes from the summit.