As to how to see and what you can see at the site in Arras, all you have to do is to try to take paths around the fort that are closest to the fort. Well, you can hardly see the inside of the fort, but you can see the outside, and this is all you can see there. These paths are also created for hiking and biking. One can actually walk around the fort and see the fort at various points along the way.
Also remind you that Arras' belfry is also inscribed in the WH list.
