The NIH campus is very accessible via Metro.  Take the Red Line towards Shady Grove to the Medical Center station.  The station’s escalators come out on the NIH campus. 

You’ll then need to get a visitor badge from the NIH Visitor Gateway Center , which will be facing you as you come up the Metro escalator. You will be required to show one form of identification (a government-issued photo ID-driver's license, passport, green card, etc.) and to state the purpose of your visit.

On exit from the Gateway Center, you will head up a path which leads right to NLM - bear left up the hill, walking past the Natcher Building (45) on your right before crossing the street to NLM.  The meeting is in the auditorium of the Lister Hill Center, which is the taller building (38A) just behind the smaller building (38).   Enter through the main doors of 38A; the auditorium will be straight ahead.  There will be signage directing you to the auditorium if you should enter 38 instead of 38A.  See the NIH Campus Map.

See the Driving Directions to the NIH Main Campus.  

You will need to enter at the Gateway Vehicle Inspection Station, which will allow you to go through an inspection and get a visitor badge before parking in the nearby MLP-11 parking lot.  See http://www.ors.od.nih.gov/maps/Pages/Gateway-Center-Map.aspx  for a map showing the Gateway Vehicle Inspection Station (numbered 66A) in relation to Rockville Pike(Rte 355).   You will be required to show one form of identification (a government-issued photo ID-driver's license, passport, green card, etc.) and to state the purpose of your visit.   

On exit from the MLP-11 parking lot, you will head up a path which leads right to NLM - bear left up the hill, walking past the Natcher Building (45) on your right before crossing the street to NLM.  The meeting is in the auditorium of the Lister Hill Center, which is the taller building (numbered 38A) just behind the smaller building (38).   Enter through the main doors of 38A; the auditorium will be straight ahead.   There will be signage directing you to the auditorium if you should enter 38 instead of 38A.  See the NIH Campus Map.