 The original structure is more or less completely disguised by substantial 17th century modifications, but within the unremarkable shell created by this later work lie two three-storey towers, each 64 feet by 33 feet with walls about 9/10 feet thick connected by a wall over ten feet thick and over 40 feet long.This wall contains two superimposed flights of stairs providing communication between the towers.Originally, the ground floors of each tower were accessible only from the first floor.