The National Institutes of Health
9000 Rockville Pike (north on Wisconsin)
The mammoth collection of buildings housing the majority of the nation's government bio-research. Consequently, the grounds have been pretty much off-limits to non-employees since the 9/11 attacks and the ensuing anthrax mailings, since there are worries about the security of the bio-weapons research programs here. But the view from Wisconsin Ave of the main building is plenty impressive. If you see a helicopter landing on that main building, it's probably the president or one of the top cabinet officialsâthis is where they get their repairs.