The citadel in Arras, which was conceived and designed by Vauban in 1668, maintained its military use up until 2010. 218 resistance fighters were martyred here when they were shot in the Citadel’s ditches between 1941 and 1944. Stone plaques in the walls commemorate each of the men. Listed as a UNESCO World Heritage site, it could have enjoyed a peaceful retirement. However, the town of Arras wanted to keep it alive and transformed it into a lively, vibrant and lived-in urban space. It is not just major cultural events which take place here such as the Main Square Festival, or sporting events such as the triathlon - it also has been party to an extensive housing programme. The old 17th century buildings have been slowly converted into apartments and the communal areas have been renovated superbly. It is a magnificent place to explore with its iconic adjacent woodland where joggers, families and people out walking can enjoy the many prepared trails.