SEPTA (tel 215/580-780 0) runs an extensive bus system and a subway (both 6.30am1am). The most useful subway lines cross the city eastwest (MarketFrankford line) and northsouth (Broad Street line); the handiest bus route is #76 , which runs from Penn's Landing and the Independence Hall area out along Market Street past City Hall to the museums and Fairmount Park. Bus and subway services require exact fares of $2; day passes , which are also good for a ride to or from the airport, go for $6. Bright purple PHLASH buses run a handy downtown loop (tel 215/580-7500; $2 one way, $4 day pass, exact change required).