Fresnel Lens at the Old Fort Niagara Lighthouse

They did not let visitors go up into the Lighthouse at Old Fort Niagara just North of Niagara Falls in Upstate NY.  There was a nearby museum that had mementos from the Lighthouse such as this nice Fresnel lens used in the Lighthouse to concentrate the light into a beam to shoot out to ships on the Great Lake Ontario and the Niagara River.