The Kennebec River Range Lights are a pair of lighthouses that ships coming up the river would line up in their sights to know they were sailing through the deep part of the river. The photo is the view from the back one towards the river where you can kind of see the other, pale against the pale background.
The final light, Squirrel Point Light, isn't off the beaten path, but the half hour hike on the path is how you get to it if you don't have a boat. It is in the process of being renovated but is not yet safe enough to allow people to go inside.
Click on any of the lighthouses to enlarge the picture.
Afterward we continued down route 127 across a few bridges and islands, including Georgetown until we hit the sea.