- Caumont Airport on the south-eastern commune border has several international routes to England. The major airport in the region with domestic and international scheduled passenger service is the Marseille Provence Airport. Water transport The Rhône has for many centuries been an important means of transportation for the city. River traffic in Avignon has two commercial ports, docking stations for boat cruises, and various riverfront developments. A free shuttle boat has been established between the quay near the city walls and the opposite bank (the île de la Barthelasse). Public transport The (TCRA) is the public transport operator for the commune of Avignon and its surrounding suburbs. TCRA operates bus services, as well as bike sharing and car pooling services. The first tram line opened in October 2019. Bicycles Avignon has of bicycle paths. In 2009 the TCRA introduced a bicycle sharing system called the Vélopop'. Cultural heritage Avignon has a very large number of sites and buildings (177) that are registered as historical monuments. In the part of the city within the walls the buildings are old but in most areas they have been restored or reconstructed (such as the post office and the Lycée Frédéric Mistral). The buildings along the main street, Rue de la République, date from the Second Empire (1852–70) with Haussmann façades and amenities around Place de l'Horloge (the central square), the neoclassical city hall, and the theatre district. Listed below are the major sites of interest with those sites registered as historical monuments indicated: Notre Dame des Doms (12th century), the cathedral is a Romanesque building, mainly built during the 12th century; the most prominent feature of the cathedral is the 19th century gilded statue of the Virgin which surmounts the western tower. The mausoleum of Pope John XXII (1334), within the cathedral, is a noteworthy example of 14th-century Gothic carving. Palais des Papes ("Papal Palace") (14th century) almost dwarfs the cathedral. The palace is an impressive monument and sits within a square of the same name. The palace was begun in 1316 by John XXII and continued by succeeding popes through the 14th century, until 1370 when it was finished. Minor churches of the town include three built in the Gothic architectural style: Church of Saint-Pierre (14th century) which has a graceful façade and richly carved doors; Church of Saint-Didier (14th century); and Church of Saint-Agricol (14th century). Other religious buildings: Church of