The Bear Island Lighthouse sits on an island on the entrance to Somes Sound on Mount desert Island, Maine. The lighthouse was built in 1839. After a period of neglect and deterioration it was purchased by the National Park Service in 1987 and has since been re-lit as a private aid to navigation. The lighthouse can be viewed from several places in Northeast Harbor, Maine but is best viewed from the water. We booked a cruise with Sea Princess cruises to Little Cranberry Island and went by the lighthouse with great views from the boat.