The Poplar Point Lighthouse is a private residence in North Kingstown, RI. It's best seen from a boat, although if you can find a way to walk along the shore it is possible to walk down the rock barrier. But the view isn't the same.
I found this lighthouse while on the way to East Mantunuck State Beach. I saw it in the distance and had to find it. After driving around for a while I did find it, as seen here in this photo. This is one of my favorite photos.