Baolis (or a water tanks) have been in use in India since ancient times to manage ground water and rain water resources. They are like an inverted multi-storey structure, descending underground to reach water source. As symbol of India’s rich architectural heritage, they have caught attention in recent times, and as a result, many of them have been restored or are in the process of restoration. For instance in New Dehli, the Hazrat Nizamuddin Baoli has been restored to its former glory through the efforts of the Aga Khan Development Network, which restored and developped the baoli as part of their Nizamuddin Urban Renewal Initiative.