National Institutes of Health

The NIH Clinical Center, located in Bethesda, Maryland, is America's clinical research hospital and the world’s largest hospital dedicated totally to clinical research.  It is a 3.37-million-square-feet facility that has 6,000 inpatient admissions a year, 95,000 outpatient visits a year, over 1,200 credentialed physicians, dentists, and Ph.D. researchers, 620 nurses, and 450 additional allied health-care professionals.