New Hampshire has these green historic signs all over the place - they are particularly thick in the seacoast region, for historic buildings or places where events of any kind of significance took place. For example, in downtown Exeter, there is one by the town hall commemorating a speech that Abraham Lincoln gave during his presidential campaign, also noting that his son went to Phillips Exeter, and across the street there is another marking that Exeter was once the capital of New Hampshire, and then a couple hundred yards away there is another marking where a tavern still stands that George Washington once ate dinner.