In New Hampshire (scattered across the state)

You'll find them scattered across the state, but nowhere are there so many so close together as in the town of Swanzey, in the state's southwest corner. Begin in Keene, following Route 10 to the left onto Matthews Road. At its end is Cresson Bridge, whose best view is from the far end, framing a red barn and maple tree. Through the bridge, turn left at the end of the road and continue south on Route 32. A left on Carleton Road leads to the 1790s Carleton Bridge, one of New Hampshire's oldest.