When you go to a small-town museum which is free and has limited opening hours(we were there during a holiday period), you tend to have low expectations. And indeed, although there were the obligatory photos of local events which can only be of interest to residents, there are also some 19th and 18th century paintings, and an interesting archaeological section, complete with the skeleton of a Merovingen warrior. There is also a good collection of coins, dating back to the Roman era. Near the entrance are some carvings which came from medieval buildings destroyed during WWII. You are not allowed to take photographs, but as the only visitors we had plenty of opportunity to look at the exhibits without feeling crowded or rushed. If you don’t read French, you may need that time to decipher the exhibit cards, which are only in French. It is located in a former chapel of the Soeurs Noires and was established in 1838. If you are in Saint-Pol-sur-Ternoise, it is worth visiting. It was significantly more interesting than I expected it would be, and is an excellent collection given the size of the town where it is located.