Prime Minister Narendra Modi has given the attention at least 100 smart cities would make in 20 years in India. The smart cities would be known as ´Cities with Brains.´ Some of these will be spanking new cities, built from the ground up. Previously, the smart cities in which is being built in Gujarat and work on which started when Modi was chief minister of the state will be ready within a few years. It is a Greenfield city, coming up just outside Ahmedabad. The smart city dream is a humungous one because of the scope and scale of its ambition. It will cost over Rs 40 lakh crore of investment.