Königstein Fortress (German: Festung Königstein), the "Saxon Bastille", is a hilltop fortress near Dresden, in Saxon Switzerland, Germany, above the town of Königstein on the left bank of the River Elbe. It is one of the largest hilltop fortifications in Europe and sits atop the table hill of the same name. The 9.5-hectare (23-acre) rock plateau rises 240 metres (790 ft) above the Elbe and has over 50 buildings, some over 400 years old, that bear witness to the military and civilian life in the fortress. The rampart run of the fortress is 1,800 metres (5,900 ft) long with walls up to 42 metres (138 ft) high and steep sandstone faces. In the centre of the site is a 152.5-metre-deep (500 ft 4 in) well, which is the deepest in Saxony and second-deepest well in Europe. The fortress, which for centuries was used as a state prison, is still intact and is now one of Saxony's foremost tourist attractions, with 700,000 visitors per year.