This book provides the first recent philosophical account of how ruins acquire aesthetic value. It draws on a variety of sources to explore modern ruins, the ruin tradition, and the phenomenon of ruin porn. It features an unusual and original combination of philosophical analysis, the author s photography, and reviews of both new and historically influential case studies, including Richard Haag s Gas Works Park, the ruins of Detroit, and remnants of the steel industry of Pennsylvania. Tanya Whitehouse shows how the users of ruins can become architects of a new order, transforming derelict sites into aesthetically significant places we should preserve.