While buildings have support beams, sidewalks obviously don't. Boston is 2/3 landfill, so the freeze/thaw cycle really does a number on sidewalks. You notice it especially in places with brick sidewalks. They almost look like waves in places.
Only maybe the section from Kilby St to Broad St is, and even that looks like it may have been natural according to this 1769 map. Anything from Kilby to Washington is natural
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