Bricks & Mortar
...Philadelphia, Pennsylvania...
 

      

      
The historic
      curb and gutter system (left) in thsi historic districts of Philadelphia
      uses cut stone curbs against a slate guttter that also served
      as a tread for wagons. The aggregate fill along the center of
      the treadway presumably served as drainage, and a more forgiving
      surface for horses. Some street sections (right) employ slate
      pavers entirely, usually set in an irregular basket weave pattern.
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