The Fairfax Court House, located in Virginia, served as a headquarters during the United States Civil War. It was first used by General George Brinton McClellan and later by General Pierre Gustave Toutant Beauregard. This building played a significant role in the early stages of the war, hosting strategic discussions and planning sessions that impacted the course of the conflict. The Fairfax Court House is a historical landmark, preserving elements of the 19th-century architecture and offering insights into the military tactics employed during the Civil War era.