Convent of the Jacobins
The convent and the church of the Jacobins were built in the 13th century to fight against local "cathare" heresy along the crusade led by French nobles that took place at the same time.
The church part is very interesting as its beautiful and typical paintings have been preserved, and contains Thomas Aquinas' relics. You will see an unusual and very high "palm tree" shaped column sustaining the roof, proof of the old european mastery of building techniques. Near the small cabin on the left of the church, you can find an hidden woodden door that will lead you to the cloister of the convent. Made of red bricks and marble, it is a great haven of tranquility and beauty, with the nice advantage of being cool during summer.
This is the perfect place to go if you want to read a book, or just relax away from the city center's activity.