New London Ledge Light stands at the mouth of New London Harbor where the Thames River meets Long Island Sound, marking an important approach to the port. Completed in 1909, it was first called Southwest Ledge Light but was renamed in 1910 to avoid confusion with another Connecticut light. Its distinctive Second Empire design makes it resemble a compact mansard-roofed house on the water, setting it apart architecturally as well as functionally. Responsibility shifted to the United States Coast Guard in 1939, and the station was automated in 1987. Listed on the National Register of Historic Places in 1990, it remains notable for both navigation and its enduring ghost legend.