Military forts are fortified structures built to protect soldiers and strategic locations. They often include walls, barracks, and storage facilities for weapons and supplies. Historically, forts were essential for defense against invasions and played a crucial role in military campaigns. Forts can vary in size and design, depending on their purpose and location. Some famous examples include Fort Knox, known for its gold reserves, and Fort Sumter, which was significant in the American Civil War. Today, many forts serve as historical sites, offering insights into military history and architecture.