Original photo by Daniel Jolivet
The origins of the castle are unknown. The oldest surviving records are from the 15th century when it was purchased by a local feudal family. The surviving buildings also date to the 15th century. The original fortifications (the walls and a moat) did not survive.
There may be a more specific term to it, but the only one I can think of is “gallery”.
Better than the “hallway balcony” than I was thinking of.