London's sewers are perhaps the forgotten underground of city: invisible spaces that rarely get the same degree of attention as the Tube. Yet, as this book shows, they are a vital part of London's infrastructure, the veritable bowels of the city. The author outlines the fascinating history of London's sewers, from the nineteenth century onwards, using a rich variety of colour illustrations, photographs and newspaper engravings to show their development from medieval spaces to the complex, modern citywide network largely constructed in the 1860s - a network still in place today. This book also explores the allure of London's sewers in both fiction and film, and how they entice intrepid explorers, from the Victorian period to the present day.