culminated in a room used as a throne room. The Palace of Westminster, shown below, comes into this category, as the monarch sits on a throne in the chamber of the House of Lords during the State Opening of Parliament. Palace of Westminster Sir Charles Barry's Palace of Westminster, more commonly known as the Houses of Parliament, has an enfilade of three Royal apartments that continues through the two legislative Chambers of the Lords and Commons. The enfilade of State Rooms presents a view from the Robing Room and Royal Gallery – B and C on the plan at right – through to the Prince's Chamber. From the throne in the adjacent Lords' Chamber (D) there is an uninterrupted view through three lobbies – Lords', Central, and Members' Lobby – to the Speaker's Chair in the Commons Chamber at the other end of the Palace. (Lords' Lobby and Members' Lobby are the round and square spaces to the left and right of E on the Plan) National Gallery, London Barry also used a number of enfilades in his extension to the National Gallery, London, built as an art gallery. These have been extended and added to in the recent Sainsbury Wing (despite the wing being at an angle to the earlier building), so that now the view down the longest enfilade traverses fifteen rooms. See also Shotgun house – similar design in vernacular nineteenth- and twentieth-century American architecture References Baroque architectural features