The fortress, one of the largest in Europe, covers 5 hectares and has 22
towers, 1.4 km of walls and three storeys of galleries and underground
It illustrates the changes in fortifications from the 11th to the 16th
centuries and the ways in which forts were originally adapted to artillery
attacks by metal cannon balls.
Its history is linked to the story of Europe itself and international
volunteers have been working on the site for 30 years. A listed historic
monument, like the late 15th-century Church of St. Lawrence.
Open: all year