New London Ledge Lighthouse is a lighthouse in Groton, Connecticut, at the mouth of New London harbor. It was built in 1909 on the southwest ledge, and it was placed in operation on November 10 of the same year, with the station’s fourth-order Fresnel lens, crafted in Paris by Henry-Lepaute Company, repeating the distinctive signature of three white flashes followed by one red flash every thirty seconds.
With its square, redbrick quarters topped with a mansard roof and a circular lantern room, it is one of the most unusual lighthouses in the United States. According to a local story, New London residents did not want to gaze out to sea at a structure that would be out of place among their large and historic homes, so Colonial and French architectural influences were used in the lighthouse.
Its light was automated in 1987, and the lighthouse was added to the National Register of Historic Places in 1990.
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