What are your favorite town line anomalies?

[Weekend Pundit]

I don't know about an anomaly, but I always thought that the miles long town line between Gilford and Gilmanton was strange, that 'strangeness' being that there are no roads between the two towns along that town line.

It proves the old saw about "You can't get there from here." To get to one from the other you have to go through either Alton or Belmont to get to Gilmanton from Gilford and vice versa.