I found it was easiest to have them arranged by state and region. When you get a lot of lighthouses, I was having a hard time locating a specific lighthouse that someone might ask about. Now I can know the area where each one is located and find it quickly.

I think it shows a lot about each region's topography when you see them grouped together. For example: NC has the tall towers, the Chesapeake Bay with the screwpiles, etc.