The 1825 Cellblock was the largest prison in the world: 476 feet long and originally four cells high and total of 800 cells. Each cell designed for one man often housed two. The cells were seven feet long by three feet wide and six feet seven inches high. Eventually two more stories were added increasing the total cells to 1,000. The plan was considered the best in the world. The 1825 Cellblock was nicknamed "The Big House" and "Castle on the Hudson"