Every five years, Massachusetts town and city officials are required to go for a walk. Specifically, they have to make sure that the markers that designate town lines are in place. Adam at Universal Hub has a neat photo of a marker being checked out on the Newton/Boston line, a map that includes the Bigelow Street are circa 1896, and a link to more photos. Nowadays we rely on things like overnight parking restrictions and resident parking to know what side of the border we are on.