From Washington, DC Beltway (I-95/I-495):

Take the Baltimore-Washington Parkway (Route 295) North to Greenbelt Road (Route 193). Take Greenbelt Road East for approximately two miles. The main gate will be on the left at the first traffic light after Cipriano Road. Park and check in at the main gate.

From Baltimore:

Take the Baltimore-Washington Parkway (Route 295) South to Greenbelt Road (Route 193). Take Greenbelt Road East for approximately two miles. The main gate will be on the left at the first traffic light after Cipriano Road. Park and check in at the main gate.

Directions to GSFC VISITOR CENTER BADGING TRAILER:
GSFC is north east of Washington, just outside the Washington Beltway.

From Washington, DC Beltway (I495/I95):

Take the Baltimore-Washington Parkway (Route 295) North to Greenbelt Road (Route 193). Take Greenbelt Road East for approximately two miles. Go past the GSFC Main Gate. Turn left at the next traffic light onto ICESAT Road. Turn left IMMEDIATELY PRIOR to the Guard Shack toward the Visitor Center. Park and check in at the Badging Trailer in the parking lot.

From Baltimore:

Take the Baltimore-Washington Parkway (Route 295) South to Greenbelt Road (Route 193). Take Greenbelt Road East for approximately two miles. Go past the GSFC Main Gate. Turn left at the next traffic light onto ICESAT Road. Turn left IMMEDIATELY PRIOR to the Guard Shack toward the Visitor Center. Park and check in at the Badging Trailer in the parking lot.