Hohensalzburg Castle sits atop the Festungsberg, a small hill in the Austrian city of Salzburg. Erected at the behest of the Prince-Archbishops of Salzburg with a length of 820 feet and a width of 490 feet, it is one of the largest medieval castles in Europe. Hohensalzburg castle was refurbished from the late 19th century onwards and became a major tourist attraction with the Festungsbahn cable car, opened in 1892, leading up from the town to the Hasengrabenbastei. It stands today as one of the best preserved castles in Europe. During the early 20th century it was used as a prison, holding Italian prisoners of war during World War I and Nazi activists (before the Anschluss with Germany) in the 1930s.