Bethesda is an unincorporated, census-designated place in southern Montgomery County, Maryland, United States, located just northwest of the U.S. capital of Washington, D.C. The National Institutes of Health main campus and the Walter Reed National Military Medical Center are in Bethesda, as are a number of corporate and government headquarters. The area commonly known as "Downtown Bethesda" is centered at the intersection of Wisconsin Avenue, Old Georgetown Road and East-West Highway. This intersection is approximately two and one-half miles from Washington, DC's western boundary, making Bethesda a close-in suburb of Washington. Other focal points of downtown Bethesda include the Woodmont Triangle, bordered by Old Georgetown Road (Maryland Route 187), Woodmont and Rugby Avenues, and the Bethesda Row, centered at the intersection of Woodmont Avenue and Bethesda Avenue.
Important medical institutions located in Bethesda include the National Institutes of Health campus, Walter Reed National Military Medical Center, and the adjoining Uniformed Services University of the Health Sciences, as well as a number of other military medical and research institutions. Other federal institutions include the Consumer Product Safety Commission, and the Naval Surface Warfare Center Carderock Division. Bethesda is the home of Congressional Country Club, which is recognized as one of the most prestigious private country clubs in the world. Congressional has hosted four major golf championships, including the 2011 U.S. Open, won by Rory McIlroy. The AT&T National, hosted by Tiger Woods, has been played at Congressional four times. Bethesda is also home of the exclusive Burning Tree Club, Bethesda Country Club, and the Bethesda Big Train, a summer collegiate baseball team.