The Limestone Kilns in Peapack are all that remains of a thriving limestone business known as Todd’s Quarry. The kilns are composed of two adjacent kilns separated by a vertical joint visible in the stone wall, which suggests they may have been constructed at different times. The front wall, constructed of hewn stone, is 26 feet high and is set into the side of a hill that provided easy access to load the limestone and fuel from the top. Lime was used for a number of purposes, including fertilizer, mortar, whitewash and leather processing. The kilns are maintained and interpreted by the Historical Society of the Somerset Hills.