Old Fort Niagara is a historic military site located at the mouth of the Niagara River in Youngstown, New York. Established in 1726, it played a crucial role in the defense of the region during various conflicts, including the French and Indian War and the American Revolutionary War. The fort features well-preserved structures, including the French Castle, which is one of the oldest buildings in the Great Lakes region. Today, Old Fort Niagara serves as a museum and educational center, offering visitors a glimpse into 18th-century military life. The site hosts reenactments, guided tours, and special events, making it a popular destination for history enthusiasts and families alike.