"The Citadel" I firmly believe it is the top attraction of the city and as far as I know I think it was also included in the waiting list for the screening of the UNESCO world heritage.
Recently opened to the public and dismissed on 2005 it was for decades a military zone active and absolutely off limits and no-fly zone, but now abandoned and open to everyone willing to visit it.
Built more than two centuries ago, here is the evidence of the passage of Napoleon and his French troops, but also for the WWI and WWII outpost, in short, is a historically valuable place. You can access the inside every day, but if you want to visit it deeper I think it can only possible on Sunday when volunteers organize free tour inside the Citadel with relevant and comprehensive explanations and historical background.
The guided tour takes about 90 minutes, visiting most of the outside, the underground and the areas that it has been built during Napoleon's invasion, still everything is as it was at the time. Some exhibits of WWII are still tangible, including in some places bullets signs on the walls. But this place needs a rapid intervention of reclamation and restoration, otherwise the risk of losing this beautiful site is very high.
Also within it there is a big park where occasional performances are held, concerts and many other activities, there is a small museum of firefighters, a very interesting museum of electricity and many other interesting things.
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