The Tour Jeanne d'Arc is the last surviving fragment of the castle built by Philippe Auguste in the 13th century, the same castle in which Joan of Arc was held and interrogated in 1431. The five-storey stone keep stands a short walk north of the station, on the slope above the Rue Jeanne d'Arc.
Inside is a small museum about the medieval city, but the building itself is the main attraction. The view from the upper storeys takes in the river, the cathedral, and the maze of streets between.