Pi Alley Garage.
Take Route 93 South towards Boston. Take Exit 24A Government Center. Go straight through the first set of lights. At the next set of lights Faneuil Hall is on the left. There are two parking garages in the immediate vincinity.
FROM THE NORTH (NORTHERN MA, NH, ME, VT, CANADA):
Enter at 275 Washington Street. Between School St and State St. 60 Staniford St. Enter at 5 Longfellow Place. Near Longellow Pl and Staniford St. 2 Battery Wharf. Enter at 2 Battery Wharf Building on Commercial St. 35 Lomasney Way. Enter at 35 Lomasney Way. 75 State Street. Enter at corner State Street and Broad Street
Take the Massachusettes Turnpike (Mass Pike/Route 90) East towards Boston. At the end of the Mass Pike, take Exit 24B Route 93 North to Exit 23 Government Center. At the end of the ramp there is a set of lights take your immediate left. Go straight through the next set of lights. At your next intersection and set of lights you will see Fanueil Hall on your immedaite left. Take a right turn to find metered street parking or go to the end and there is a parking garage. (You will have to make several right turns to the entrance).
FROM THE SOUTH (SOUTHERN MA, RI):
Take Route 93 North towards Boston. Proceed to Exit 23 and follow directions as above.
Exit airport and proceed through the Calahan Tunnel at the end of the tunnel follow signs to Government Center.