The glow of the sun hits the waters of Boston Harbor as a container ship comes into port on an early morning last week. The tower in the foreground is the #5 green marker located between Castle Island and Spectacle Island.

The glow of the sun hits the waters of Boston Harbor as a container ship comes into port on an early morning last week. The tower in the foreground is the #5 green marker located between Castle Island and Spectacle Island.