Fairfax is a city in northern Virginia. Its National Firearms Museum has a huge collection of centuries-old guns. The Historic District includes 19th-century buildings like the Fairfax Courthouse and the Ratcliffe-Allison-Pozer House. The Civil War Interpretive Center at Historic Blenheim house has interior walls covered with soldiers’ graffiti. Among many open spaces, Daniels Run Park offers woodlands and trails.