Crystal City is a neighborhood located in Arlington, Virginia, just across the Potomac River from Washington, D.C. It is known for its modern high-rise buildings, shopping centers, and proximity to the Ronald Reagan Washington National Airport. The area has a mix of residential, commercial, and office spaces, making it a vibrant urban community. The neighborhood is also recognized for its extensive underground shopping and transportation network, often referred to as the Crystal City Underground. This unique feature connects various buildings and provides easy access to restaurants, shops, and the Washington Metro system, enhancing the convenience for residents and visitors alike.