Paris has a very well developed network of public transportation. Metro subways, RER, Regional express services and bus operate here. Metro system is very well developed and links urban areas of the city. There are 300 stations on 16 lines of metro. A tour bus- bus no. 72 can be used to take a tour of major tourist destinations. From CDG Airport one can take commuter train or RER B3 to reach here. Bus RATP 351 will also bring you here, Express shuttle bus services are also available from Beauvais Airport. From Orly Airport one can take RER B or bus RATP 183 to reach here. RER is a network of 5 express lines. There are also tourist pass available which can be bought from the nearest station.