There was a time when lights on lighthouses didn't flash. Before that time, it was common to place more than one lighthouse in close proximity to help mariners identify which lighthouse they were looking at.

Along the East Coast here are some examples of multiple light stations:


[*]Navesink NJ - two towers

[*]Nobska MA - once had two towers, later one tower was moved to Nauset Beach

[*]Three Sisters MA - now out of commission but since repositioned in the woods behind Nauset

[*]Thatcher Island - two towers

[*]Matinicus Light - two towers

Others?