The Huron Lightship was retired from active service in 1970. Lucky for us, this last lightship of the Great Lakes is now a museum. It acts as a floating lighthouse anchored in areas where it is too deep, expensive or impractical to construct a lighthouse. See the light is displayed at the top of the mast? The locals called her "Old B.O." because of the sound her fog horn made. Built in 1920, she was moved in 1935 to Lake Huron to guide ships just north of the Blue Water Bridge where she stayed until she retired. Declared a National Historic Landmark in 1989, you can find her in Pine Grove Park and open for tours beginning April 15.