This diminutive outpost doesn't seem quite sturdy enough to stop rampaging French and Indians, does it? Luckily, this blockhouse was only one small part of a much larger fort, which was built in 1754 to protect the locals from just such an attack. The structure was sufficiently stout to survive for centuries — it was the oldest of its kind in the nation — until the great flood of April 1, 1987. That's when one of Maine's larger rivers broke its bounds and flushed the blockhouse and a lot of other stuff downstream.By that time the fort was part of a popular state park and the focal point of the community, which had literally sprung up around it. So the good people rebuilt it, using as many of the original timbers as they could collect. (Some had floated forty miles.) Have you been to this historic garrison? Send us a note if you can identify this riverside spot.