When writing about Baltimore, please keep in mind that those quaint streets in places like Fells Point are not cobblestoned.
Repeat: Do not write about Baltimore's quaint cobblestoned streets.
Cobblestones are round, like cannonballs. Cobbles are typically formed naturally, by erosion in rivers.
Those quaint Baltimore streets are paved with Belgian blocks, or setts, which are quarried and rectangular. Those in Baltimore sometimes arrived as ballast in ships.
Mistaking streets paved with Belgian blocks for cobblestoned streets is sheer carelessness.