One of Boulogne's major claims to fame is its ancient fortified city, parts of the walls of which date to the second century A.D. The buildings only go back to the 17th century for the most part, but they are very beautiful. We visited the old city the afternoon we arrived and planned to go back the next day for more pictures, but our full day in Boulogne was cloudy, cool, and even a little drizzly, so we stayed home.