from Olney From downtown Olney, take Route 108 west, towards Laytonsville, for about 1 mile. Turn left (SW) on Bowie Mill Road. Past Cashell Rd. NHPC on the RHS about 1 1/2 mile from Rt 108. (total driving time about 10 minutes) from Rockville From downtown Rockville, take Viers Mill Road east, towards Aspen Hill. Turn left at Route 28 (Norbeck Rd) north. Past Baltimore Rd., Gude Road, Manor Park and Muncaster Mill Road, turn left on Georgia Avenue, (northbound) and proceed to Olney (intersection of Rt 108 and Georgia Avenue - Rt 97). Follow above directions from Olney to NHPC. (total driving time about 25 minutes) from Gaithersburg From downtown Gaithersburg, go south on Rt 355 (Hungerford Road) to Shady Grove Road, turn left (NE). At Muncaster Mill Road, turn right, past fire house and through Redland Road / Muncaster Mill Road intersection. Proceed on Muncaster Mill Road until Bowie Mill Road, and turn left. Take Bowie Mill Road to NHPC on LHS. (total driving time about 20 minutes)