The Église des Réformés — officially Saint-Vincent-de-Paul — is the most dramatic church on the Canebière, Marseille's main boulevard. Built between 1855 and 1888 in a neo-Gothic style, its twin towers are a landmark visible from much of the city center. The interior is cool and quiet, a contrast to the noise of the boulevard outside. Worth a look if you're walking up from the Vieux-Port.
Eglise des Réformés
Neo-Gothic twin-towered church on the Canebière