Graves Lighthouse is one of the best sights to see in the harbor, and it can only be seen up close via boat. Located on a rock outcrop about four miles NE of the harbor entrance in Winthrop, this lighthouse is one of the furthest east parts of Boston Harbor- it is essentially in open water. The lighthouse is over 100 years old and unlike the functioning Boston Light three miles to the Southwest, Graves is no longer in use. However, it looks very beautiful (and a bit spooky) out there on its distant rock outcrop. I found this website about Graves Light which contains a great amount of interesting information.
Take the south channel and approach very carefully- being cognizant of the Devil’s Back and Roaring Bulls if approaching from the West/SW, and of the Graves Ledge if approaching from the North/NE.