Fort Sumter National Monument is a historic site located in Charleston Harbor, South Carolina. It is best known as the location where the first shots of the American Civil War were fired on April 12, 1861. The fort was constructed to protect the harbor and was named after General Thomas Sumter, a hero of the American Revolution. Today, the monument includes the fort itself, as well as surrounding waters and islands. Visitors can explore the fort's history through guided tours and exhibits, learning about its significance in American history and the events that unfolded during the Civil War.