Book excerpt: Delhi heritage top 10 Series is a comprehensive guide to Delhi heritage icons and architectural gems. The first volume in the series delves into the fascinating history and the great significance of forgotten, subterranean, man-made water structures, commonly known as baolis or stepwells. The book walks us through the top ten baolis, with two special mentions at the end. Besides giving a vivid description of the functioning and revival of the baolis, the book also focuses on the social importance of each structure. The work is an outcome of a three-year-long research from various archives and contains historic as well as modern photographs along with architectural drawings. The Foreward has been written by Prof. Sohail Hashmi.