<human>:  Why is the neighborhood I live in called Cobble Hill?
<bot>: Cobble Hill is named after the cobblestones that used to cover the street in the 19th century. Cobblestones are a type of stone that is made up of many small stones glued together. Cobblestones are often used in streets and sidewalks, but they are also used in other places, such as the exterior of buildings.