Arlington is a city located in Virginia, just across the Potomac River from Washington, D.C.. It is known for its vibrant neighborhoods, parks, and historical sites, including the famous Arlington National Cemetery, which honors military veterans. The city is also home to the Pentagon, the headquarters of the United States Department of Defense. Arlington has a diverse population and offers a mix of urban and suburban living. It features a variety of public transportation options, including the Washington Metro, making it easy to commute to the nation's capital. The city is recognized for its excellent schools and thriving economy.