Swimmers escorted by kayakers circle Alligator Reef Lighthouse during the Swim for Alligator Lighthouse open-water challenge Saturday, Sept. 7, 2024, off Islamorada, Fla., in the Florida Keys.

On a mission to raise awareness about the threat, Maine Preservation has nominated the state's lighthouses to the 2025 World Monuments Watch, a program of the World Monuments Fund, which works to ...