Though often referred to colloquially as a city, Arlington is, in fact, an entire county — the place you’ll land after crossing the Potomac from the heart of Washington into Virginia. Here, you’ll find a dynamic mix of urban and suburban neighborhoods. Arlington’s eastern reaches include Reagan National Airport, the Pentagon, and Crystal City, a soaring downtown of residential high-rises and office towers. It’s one of a handful of Arlington’s "urban villages," which benefit from convenient access to the Metrorail and the high-volume Columbia Pike bus line. Arlington’s more vertically developed metro corridor gives way to leafier locales, brimming with single-family residences, townhouses, and garden apartments. The neighborhoods of Ballston, Rosslyn, Shirlington, and Clarendon are also part of Arlington, as are Aurora Highlands, Fairlington, Country Club Hills, Donaldson Run, and East Falls Church.