AHMEDABAD, INDIA—A 5,000-year-old stepwell has been discovered in Dholavira, one of the largest known cities of the Indus Valley civilization. Scientists from the Archaeological Survey of India and IIT-Gandhinagar say that the well is almost three times bigger than the Great Bath at Mohenjo Daro. They will use 3-D laser scanners, remote-sensing technology, and ground-penetrating radar to analyze Dholavira’s ancient water system. “Various surveys have indicated other reservoirs and stepwells may be buried in Dholavira. We also suspect a huge lake and an ancient shoreline are buried in the archaeological site,” V.N. Prabhakar of IIT Gandhinagar told The Times of India. To see images of similar, though later sites, see ARCHAEOLOGY's "The Islamic Stepwells of Gujarat, India."