Take in the grandeur of Besancon Cathedral. Schedule in a mass if you can or just wander around and enjoy a break from the outside world.
Besancon Old Town is where you'll find Besancon Cathedral. Admission is free, which means you'll have more cash in your wallet to explore! Other worthwhile attractions close to the principal church include Besancon Citadel, Citadel of Besancon and Micropolis Conference Center.