In the almost 6,000 miles of streets, roads and highways in the five boroughs of New York City, only about 15 miles are still paved with cobblestones. As noted by the New York Times: Starting in the 17th century, cobblestones (cobbling refers to the shaping of the stones) began to replace the city’s oyster shell and dirt streets. Round stones were used until the introduction of flat oblong granite, known as Belgian block, which was brought in as ship ballast. … In the mid-to-late 19th century, cobblestones began to be phased out as a primary material, in favor of less expensive concrete.
One major concrete highway along the Manhattan side of the East River, the FDR Drive, has a foundation built, in part, of ballast bricks of a much newer vintage. Continue reading