G M.
Google
Along with the cathedral, this is a must see in Toulouse. It is five euros for adults to enter, but it is absolutely worth it. With the restoration work that is going on the exterior. The entrance is via the refractory. In here, several of the lunettes have been removed from the walls and are being restored on the ground. The church chapter house and other areas are absolutely fascinating. There are many audiovisual guides which explain some of the amazing architecture and history. It would be very easy to spend an hour to two hours, marveling at this beautiful building.