even number of bays and no centrepiece. The emphasis is placed on the end bays, each highlighted by double pairs of pilasters, of which the inner pairs project outwards. The west and north fronts may have been the work of Thomas Archer, possibly in collaboration with the Duke himself. The west front has nine wide bays with a central pediment supported by four columns and pilasters to the other bays. Due to the slope of the site, this front is taller than the south front. It is also large, with many other nine-bay three-storey façades little more than half as wide and tall. The west front is very lively with much carved stonework, and the window frames are highlighted with gold leaf, which catches the setting sun. The north front was the last to be built. It presented a challenge, as the north end of the west front projected nine feet (3 m) further than the north end of the east front. The problem was overcome by building a slightly curved façade to distract the eye. The attic windows on this side are the only ones visible on the exterior of the house and are set into the main façade, rather than into a visible roof. Those in the curved section were originally oval, but are now rectangular like those in the end sections. The north front was altered in the 19th century, when William Cavendish, 6th Duke of Devonshire, and the architect Jeffry Wyatville, built the North Wing, doubling the size of the house. Most of the wing has only two storeys, as opposed to the three of the main block. It is attached to the north-east corner of the house and around 400 feet (120 m) long. At the end of the North Wing is the North, or Belvedere, Tower. The work was carried out in an Italianate style that blends smoothly with the elaborate finish of the baroque house. The 6th Duke built a gatehouse at this end of the house with three gates. The central, largest gate led to the North Entrance, then the main entrance to the house. This is now the entrance used by visitors. The north gate led to the service courtyard, while the matching south gate led to the original front door in the west front, which was relegated to secondary status in the Duke's time, but is now the family's private