Whaleback Lighthouse is one of the least glamorous lighthouses in the region. The solitary granite structure resides on Whaleback ledge at the mouth of Portsmouth Harbor. It's unique location makes for great photographs throughout the day and from different vantage points in the harbor. Like many lighthouses today, it is unmanned. The first lighthouse, referred to as "Whales Back", to occupy the ledge was built in 1829-30 at a cost nearly $21,000. A newer version of Whaleback was built in 1870-72 to replace the original that proved itself to be of poor construction and threatened to collapse. For a time the old lighthouse tower served as a fog signal house only to be replace by a cast iron fog signal that remained for a brief time.