Fort architecture refers to the design and construction of military fortifications, which are built to protect against attacks. These structures often feature thick walls, bastions, and moats, allowing for defense against enemy forces. Forts can vary in style, influenced by the time period and location, with examples ranging from medieval castles to modern military bases. Historically, fort architecture has played a crucial role in warfare and territorial defense. Notable examples include the Great Wall of China, Fort Sumter in the United States, and Citadel of Quebec in Canada. Each of these forts showcases unique architectural elements tailored to their specific defensive needs.