The great houses of London represent one of the marvels of English architecture and yet they are almost entirely unknown. They are for the most part disguised behind sober facades but their riches within are astonishing. From the romantic 17th century Ashburnham House, nestling in the shadow of Westminster Abbey, through the splendid 18th century aristocratic palaces of the West End, to the curious and quirky arts and crafts houses of Holland Park and Kensington, to the cool modernist houses of Hampstead and the exuberant post-modern interiors of the last thirty years, every house has its own story to tell.