From About.com:

Reston, Virginia is a suburb of Washington, DC, located in the heart of the rapidly growing Dulles Technology Corridor. It was a planned community built in the 1960s with a variety of housing styles, centered around Reston Town Center, a retail village with commercial buildings, restaurants, a movie theater, an ice skating rink, hotel, and shops. Residents are members of the Reston Association which gives them access to lots of amenities including four lakes, 15 swimming pools, 49 tennis courts, 55 miles of paved trails, 26 ball fields, two community centers and several picnic areas and playgrounds.

Reston is located in Fairfax County, Virginia approximately 20 miles west of Washington, DC and six miles from the Dulles International Airport.