Boston's Christ Church - better known as Old North Church - was built in 1723. The church is best-known for its steeple, where one night in 1775, patriots hung two lanterns to signal that British troops were moving by water out of Boston, leading to the first shots of the American Revolutionary War. American History TV toured the church - and in this portion - we follow in the footsteps of the lantern hangers, venturing into areas off-limits to the general public.