Festung Hohensalzburg 

Festung Hohensalzburg's history and travel information by castletourist.com
Image by Sushuti from Pixabay

Hohensalzburg Fortress is a large medieval fortress in the city of Salzburg, Austria. It sits on the top of the Festungsbergat at an altitude of 506 m.

 It was erected at the behest of the Prince-Archbishops of Salzburg.

The fortress is 250 m (820 ft) long and 150 m (490 ft) wide making it one of the largest medieval castles in Europe.