1. Nonnberg Abbey, also known as Stift Nonnberg, is a Benedictine monastery located in the heart of Salzburg, Austria. It is the oldest women’s religious house in the German-speaking world, with a history dating back over 1,300 years. The abbey has a rich cultural and artistic heritage, with a stunning interior decorated with frescoes, paintings, and sculptures. It is also famous for being the place where the real-life Maria von Trapp, whose story inspired the \"Sound of Music\" musical and film, was a novice nun. Visitors can explore the abbey’s chapel, library, cloister, and museum, as well as attend daily mass and join guided tours.

2. The opening hours of Nonnberg Abbey vary throughout the year, but it is generally open to visitors from Monday to Saturday, 9:00 am to 11:45 am and 2:00 pm to 6:00 pm, and on Sundays and holidays from 10:00 am to 11:45 am and 2:00 pm to 6:00 pm. The abbey can be reached by foot from the historic center of Salzburg, or by bus or taxi.

3. Admission to Nonnberg Abbey is €4 for adults, €2 for students and seniors, and free for children under 14. Tickets can be purchased at the abbey’s entrance or online in advance.