270 South to Interstate 495 South/North VA/Washington. Take exit 43 for VA 193 GW Parkway. Take exit for Roosevelt Bridge, keep left. Cross Roosevelt Bridge, merge onto Constitution. Turn left onto 15th Street. Right onto Pennsylvania Avenue, NW. Center on left. I395 North, continue straight onto US 1 North (signs for 14th Street/National Mall). Continue onto 14th Street, NW. Turn right onto Pennsylvania Avenue, NW. Metro accessible via Metro Center Station (Red line) or Federal Triangle Station (Blue and Orange line).