For years, tiny Pigeon Key, located 2 miles west of Marathon (basically below the Old Seven Mile Bridge) housed the rail workers and maintenance men who built the infrastructure that connected the Keys. Today you can tour the structures of this National Historic District or relax on the beach and get in some snorkeling. Ferries leave Knight’s Key (to the left of the Seven Mile Bridge if you’re traveling south) to Pigeon; the last one returns at 4pm.
The Old Seven Mile Bridge, meanwhile, is closed to traffic and now serves as ‘the World’s Longest Fishing Bridge’; park at the northeastern foot of the bridge and have a wander.
