This watch tower, called the Portland Observatory, was built in the 1800’s as a means of seeing ships from as far away as 30 miles. There are 3 flag poles atop the tower and the watchman would raise the flag of the ship coming in so that the family could meet them at the dock to help them unload their ships. Today visitors can tour a museum focusing on the history of the tower and climb to the top for a spectacular view of the city and the harbor.