38.85140278, -77.05068889
Crystal City is an urban neighborhood in the southeastern corner of Arlington County, Virginia, south of Downtown Washington, D.C. Due to its extensive integration of office buildings and residential high-rise buildings using underground corridors, travel between stores, offices, and residences, it is possible to travel much of the neighborhood without going above ground, making at least part of Crystal City an underground city.
Crystal City includes offices of numerous aerospace manufacturing and defense industry companies, public sector consulting firms, government contractors, the United States Department of Labor, the United States Marshals Service, satellite offices for the Pentagon, various NGOs and nonprofits (including IFES), and the headquarters for PBS. It is also the location of Ronald Reagan Washington National Airport.