This historic site in New York are the ruins of Fort St. Frederic in Crown Point, New York.
Built between 1734 and 1738 at a strategic location on Lake Champlain where the lake narrows, this stone fortress once garrisoned hundreds of French officers and men whose raiding parties kept British settlements in a constant state of alarm. During its years of operation, Fort Saint-Frédéric also became an outpost of French culture with farms and a thriving community that steadily grew until 1759, when during the French and Indian War, the fort was hastily evacuated upon the advance of the British army. Instead of allowing the British to take the fort, the French demolished Fort St. Frederic.
Today, you can explore the ruins of Fort St. Frederic as well as the ruins of the larger fort that the British built next to it, Fort Crown Point.