All NIH visitors must go through a security clearance at the new NIH Gateway Center to receive a visitor's badge. Visitors may be required to pass through a metal detector and have bags/purses inspected or x-rayed. All visitors must present a government-issued photo ID to enter the campus.
The Washington D.C. Metrorail system has a station on the NIH campus called "Medical Center." Upon exiting the station, it is a short walk to the NIH campus shuttle, which will take you to NIH buildings on the main campus and in Rockville.
Metrorail service is available from Ronald Reagan Washington National Airport and from Union Station (railway). Take Metro's Red Line to the Medical Center Station.
The Natcher Conference Center (Building 45) is located on the NIH main campus. Visitor parking is limited, so take public transportation if possible. The campus is located on the Red Line at the Medical Center Metro stop. Proceed to the new NIH Gateway Center for security clearance. The Natcher Conference Center is located a short distance behind the Gateway Center.
See http://www.nih.gov/about/visitor/ for more information.
The estimated fare (one-way) from the three local airports to Natcher are:
For those wishing to stay overnight, there are numerous hotels in the Bethesda/Rockville area.