You may see Vienne Cathedral in the skyline before you actually find this important religious building. Take a seat inside if the doors are open or just admire the facade from outside.
You can keep your wallet safely stashed away, because it won't cost a cent to visit Vienne Cathedral. Located in Centre Ville, you'll find some worthwhile attractions not far from this principal church. Why not visit Theatre Antique, Temple dAuguste et de Livie and Gallo-Roman Museum of Saint-Romain-en-Gal too?