One of the largest hilltop fortifications in Europe, Konigstein (‘King’s Rock’) is located in Germany’s idyllic Saxon Switzerland National Park. The original fortress structure was expanded in the late 1500s to form a walled citadel, considered by many to be unconquerable. This reputation is reflected time and time again in it’s history, with the castle alternating between keeping people out and locking them in! Over the years Konigstein has been used as a castle, a monastery, a provisions store, a military hospital, a country retreat, a POW camp and a state prison. Since 1955 Konigstein Fortress has been welcoming visitors to its renowned open-air military museum and remains one of Saxony’s most popular tourist attractions. Of particular interest is the well of Konigstein Fortress, which is 152.5 metres deep, the second deepest well in Europe.