>>8930608 , >>8930675, >>8930872

Piling on here-

Old North Church, found in the City of Boston

193 Salem st

42°21′58.78″N 71°3′16.04″W

https://en.wikipedia.org/wiki/Old_North_Church

From the Wiki:

In April 1775, Paul Revere told three Boston patriots to hang two lanterns in the steeple.

These men were the church sexton Robert Newman and Captain John Pulling—the two of whom historian David Hackett Fischer suggests each carried one lantern up to the steeple—as well as Thomas Bernard, who stood watch for British troops outside the church.

The lanterns were displayed to send a warning to Charlestown patriots across the Charles River about the movements of the British Army. Revere and William Dawes would later deliver the same message to Lexington themselves, but this lantern method was a fast way to inform the back-up riders in Charlestown about the movements of the British; these back-up riders planned to deliver the warning message to Lexington and Concord in case Revere and Dawes were arrested on the way.

The lanterns were hung for just under a minute to avoid catching the eyes of the British troops occupying Boston, but this was long enough for the message to be received in Charlestown.

The militia waiting across the river had been told to look for the signal lanterns, and were prepared to act as soon as they saw them.

The meaning of two lanterns has been memorized by countless American schoolchildren.

"One if by land, and two if by sea" is from Henry Wadsworth Longfellow's poem "Paul Revere's Ride".

One lantern was to notify Charlestown that the British Army would march over Boston Neck and the Great Bridge, and two were to notify them that the troops were taking boats across the Charles River to land near Phips farm (the British Army would take the "sea" route; thus, two lanterns were hung). After receiving the signal, the Charlestown Patriots sent out a rider to Lexington, but this rider did not reach his destination and his identity has disappeared from history, having possibly been captured by a British patrol.

But the warning was delivered miles away to dozens of towns, first by Revere and Dawes on horses, and then by other men on horses and men who rang church bells and town bells, beat drums, and shot off warning guns.

The current status of the lanterns is not entirely clear; one is said to be in the hands of a private collector, another was broken during a tour, and yet another is on display at the Concord Museum.