Westminster Abbey, the Palace and St Margaret's illustrate in a concrete way the specificities of parliamentary monarchy over nine centuries. Whether one looks at the royal tombs or the chapter house, the remarkable vastness of Westminster Hall, of the House of Lords or of the House of Commons, art is everywhere present and harmonious, making it a veritable museum of the history of the United Kingdom. Westminster Abbey is a unique artistic construction representing a striking sequence of the successive phases of English Gothic art. In addition to its influence on English architecture during the Middle Ages, the abbey has played another leading role by influencing the work of Barry and Pugin at Westminster Palace, in the 'Gothic Revival' of the 19th century.