<human>:  Why is the neighborhood of Cobble Hill called Cobble Hill?
<bot>: Cobble Hill was named after the cobblestones that were used in the street construction. The cobblestones were used to make the streets in the area level. Cobble Hill was first settled in the late 18th century, and it was a part of Brooklyn until 1898 when it was annexed by the City of New York.