Nünnberg Abbey in Salzburg.
This was where Maria was a nun before she married Captain Von Trapp.
Nünnberg Abbey refused to let film crews in to shot movies inside, that
was why in Julie Andrews' 1965 movie "The Sound of Music" it could only show
the Von Trapp's children hanging outside the iron gate asking to see Maria.

Salzburg with the white-colored Festung (Fortress) in the background  

Mozart was born in a small apartment in the yellow building in 1756.

During the Sound Of Music dinner show, Austin was one of the audiences
asked to go up stage to dance with the performers.

Mirabell Palace Garden.
The Sound of Music movie shot many scenes here.
The Festung can be seen in the background.