What once used to be a tower guarding the entrance to the city, now houses a museum of popular arts. The building's foundation dates back to the second half of the 14th century and it also served as a prison for a certain period of time.
Wikipedia https://en.wikipedia.org/wiki/Castillet
Address 2 Rue du Castillet, Perpignan 66000, France
Coordinates 42°42'2.231" N 2°53'38.7" E