The Old North Church is a must-see Freedom Trail destination! Founded in 1723, Old North is the oldest still-standing church building in the city of Boston. Old North is world famous for the events of April 18, 1775, when allies of Paul Revere held two lanterns in the church's steeple as a signal that British troops were heading to Lexington and Concord "by sea" across the Charles River. This momentous act ignited the American Revolution.