Bhopal (; ) is the capital city of the Indian state of Madhya Pradesh and the administrative headquarters of both Bhopal district and Bhopal division. It is known as the City of Lakes due to its various natural and artificial lakes. It is also one of the greenest cities in India. It is the 16th largest city in India and 131st in the world. After the formation of Madhya Pradesh, Bhopal was part of the Sehore district. It was bifurcated in 1972 and a new district, Bhopal, was formed. Flourishing around 1707, the city was the capital of the former Bhopal State, a princely state of the British ruled by the Nawabs of Bhopal. Numerous heritage structures from this period include the Taj-ul-Masajid and Taj Mahal palace. In 1984, the city was struck by the Bhopal disaster, one of the worst industrial disasters in history. Bhopal has a strong economic base with numerous large and medium industries operating in and around the city. Bhopal is considered as one of the important financial and economic destinations in Madhya Pradesh's two strong wealth pillars, the other being Indore. Bhopal's GDP(nominal) was estimated at INR 44,175 crores (2020–21) by the Directorate of Economics and Statistics, Madhya Pradesh. A Y-class city, Bhopal houses various educational and research institutions and installations of national importance, including ISRO's Master Control Facility, BHEL and AMPRI. Bhopal is home to a large number of institutes of National Importance in India, namely, IISER, MANIT, SPA, AIIMS, NLIU, IIFM, NIDMP and IIIT (currently functioning from a temporary campus inside MANIT). Bhopal city is also the divisional headquarter of Bhopal division of west central railways (WCR), whose office is located at Habibganj. Bhopal city also has Regional Science Centre, Bhopal, one of the constituent units of the National Council of Science Museums (NCSM). The city attracted international attention in December 1984 after the Bhopal disaster, when a Union Carbide pesticide manufacturing plant (now owned by Dow Chemical Company) leaked a mixture of deadly gases composed mainly of methyl isocyanate, leading to one of the worst industrial disasters in the world's history. The Bhopal disaster continues to be a part of the socio-political debate and a logistical challenge for the people of Bhopal. Bhopal was selected as one of the first twenty Indian cities (the first phase) to be developed as a smart city under PM Narendra Modi's flagship Smart Cities Mission. Bhopal